CUET UG Chemistry Booster Test - 1 Nomenclature of Amines -

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CUET UG Chemistry Booster Test - 1 Nomenclature of Amines

⏱️ 30 Minutes

❓ 20 Questions

📌 Answers are locked once submitted — results and explanations appear at the end.

CUET UG Chemistry Booster Test - 1 Nomenclature of Amines

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QUESTION 1 OF 20

📄 Passage

In arylamines, –NH₂ group is directly attached to the benzene ring. C₆H₅NH₂ is the simplest example of arylamine. In common system, it is known as aniline. It is also an accepted IUPAC name. While naming arylamines according to IUPAC system, suffix 'e' of arene is replaced by 'amine'. Thus in IUPAC system, C₆H₅–NH₂ is named as benzenamine.

According to the analytical passage, the primary functional characteristic strictly defining an arylamine is the direct attachment of the –NH₂ group to which entity?

Answer Review

📄 Passage

According to the analytical passage, the primary functional characteristic strictly defining an arylamine is the direct attachment of the –NH₂ group to which entity?

A An alkyl group

B The benzene ring

C A carbon chain

D A halogen

💡 Short Explanation

�� Arylamines contain –NH₂ directly attached to an aromatic ring. �� Benzene ring is the defining aryl structure. �� Aniline is the simplest arylamine.

✅ Correct Answer Explanation

The passage clearly states that in arylamines, the –NH₂ group is directly attached to the benzene ring. This direct attachment distinguishes arylamines from alkylamines, where –NH₂ is attached to an aliphatic carbon chain.

❓ Why Other Options Are Incorrect

�� Option A → Alkyl group attachment gives alkylamine, not arylamine.
�� Option C → A carbon chain represents aliphatic amines.
�� Option D → Halogen is not the defining attachment point of arylamines.

🎯 Strategy

Used

Contextual/Tonal Matching

Application:

�� The answer is directly stated in the passage.

Final Logic:

�� Arylamine = –NH₂ directly attached to benzene ring.

🧠 Memory Trick

Aryl = Aromatic ring

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: Arylamines

📄 Passage

Based directly on the passage text, what are the formal accepted IUPAC names for the molecule C₆H₅NH₂?

A Aniline and Aminobenzene

B Aniline and Benzenamine

C Benzenamine only

D Phenylamine only

💡 Short Explanation

�� C₆H₅NH₂ is commonly called aniline. �� Aniline is also accepted as an IUPAC name. �� Its systematic IUPAC name is benzenamine.

✅ Correct Answer Explanation

The passage states that C₆H₅NH₂ is known as aniline in the common system and that aniline is also an accepted IUPAC name. It also states that in the IUPAC system, C₆H₅NH₂ is named benzenamine. Hence, both Aniline and Benzenamine are accepted.

❓ Why Other Options Are Incorrect

�� Option A → Aminobenzene is not the pair given in the passage.
�� Option C → Benzenamine is correct, but aniline is also accepted.
�� Option D → Phenylamine is not the accepted pair stated in the passage.

🎯 Strategy

Used

Contextual/Tonal Matching

Application:

�� Identify the names explicitly mentioned in the passage.

Final Logic:

�� Passage mentions both aniline and benzenamine.

🧠 Memory Trick

Aniline = Benzenamine

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: Nomenclature of Arylamines

3 What is the accepted common name of the unbranched aliphatic amine formula CH₃-CH₂-CH₂-NH₂?

A Propan-1-amine

B n-Propylamine

C Isopropylamine

D Propionamide

💡 Short Explanation

�� CH₃CH₂CH₂NH₂ is a straight-chain propyl amine. �� Common naming uses alkyl group + amine. �� Straight-chain propyl group is called n-propyl.

✅ Correct Answer Explanation

CH₃CH₂CH₂NH₂ contains a normal propyl group attached to –NH₂. In the common system, aliphatic amines are named by prefixing the alkyl group to amine. Therefore, its common name is n-Propylamine.

❓ Why Other Options Are Incorrect

�� Option A → Propan-1-amine is the IUPAC name, not the common name.
�� Option C → Isopropylamine has –NH₂ attached to the second carbon.
�� Option D → Propionamide is an amide, not an amine.

🎯 Strategy

Used

Elimination

Application:

�� Separate common name from IUPAC name and identify straight-chain structure.

Final Logic:

�� Straight-chain propyl amine = n-Propylamine.

🧠 Memory Trick

n = normal straight chain

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: Common Nomenclature of Amines

4 Arrange the following alkylamines analytically in increasing order of their molecular mass (and corresponding carbon chain size):
(A) Methylamine
(B) Ethylamine
(C) n-Propylamine

A (A), (B), (C)

B (C), (B), (A)

C (B), (A), (C)

D (A), (C), (B)

💡 Short Explanation

�� Methylamine has one carbon. �� Ethylamine has two carbons. �� n-Propylamine has three carbons.

✅ Correct Answer Explanation

Molecular mass increases with increasing carbon chain size. Methylamine = CH₃NH₂ Ethylamine = C₂H₅NH₂ n-Propylamine = C₃H₇NH₂ Thus, increasing order is: (A), (B), (C)

❓ Why Other Options Are Incorrect

�� Option B → Gives decreasing order.
�� Option C → Places ethylamine before methylamine incorrectly.
�� Option D → Places n-propylamine before ethylamine incorrectly.

🎯 Strategy

Used

Ordering

Application:

�� Compare carbon chain length.

Final Logic:

�� 1C < 2C < 3C.

🧠 Memory Trick

Meth < Eth < Prop

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: Alkylamine Nomenclature

5 Statement analysis regarding the naming framework of secondary amines:
(A) The prefix 'di' conceptually indicates two identical alkyl/aryl groups attached to nitrogen.
(B) The nomenclature N-Methylethanamine requires the 'di' prefix.
(C) Diethylamine functions as an example of a simple secondary amine.

A A and B only

B A and C only

C B and C only

D A, B, and C

💡 Short Explanation

�� "Di" is used for two identical groups. �� N-Methylethanamine has different groups. �� Diethylamine is a simple secondary amine.

✅ Correct Answer Explanation

Statement A is correct because the prefix "di" indicates two identical groups attached to nitrogen. Statement C is correct because diethylamine has two identical ethyl groups attached to nitrogen, making it a simple secondary amine. Statement B is incorrect because N-Methylethanamine has methyl and ethyl groups, so the groups are different and "di" is not used.

❓ Why Other Options Are Incorrect

�� Option A → Includes Statement B, which is incorrect.
�� Option C → Includes Statement B and omits Statement A.
�� Option D → Includes incorrect Statement B.

🎯 Strategy

Used

Option Grouping

Application:

�� Check whether the groups attached to nitrogen are identical or different.

Final Logic:

�� Identical groups use "di"; mixed groups use N-substitution naming.

🧠 Memory Trick

Di = Duplicate groups

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: Nomenclature of Secondary Amines

6 A secondary amine with two identical phenyl groups attached directly to the nitrogen is classified analytically as a:

A Simple aliphatic amine

B Mixed aliphatic amine

C Simple aromatic amine

D Mixed aromatic amine

💡 Short Explanation

�� Two identical phenyl groups make it simple. �� Phenyl groups are aromatic groups. �� It is a secondary aromatic amine.

✅ Correct Answer Explanation

A secondary amine has two carbon-containing groups attached to nitrogen. If both groups are identical phenyl groups, the amine is simple because the substituents are the same. Since phenyl is an aromatic group, it is classified as a simple aromatic amine.

❓ Why Other Options Are Incorrect

�� Option A → Phenyl groups are aromatic, not aliphatic.
�� Option B → It is neither mixed nor aliphatic.
�� Option D → It is aromatic, but not mixed because both groups are identical.

🎯 Strategy

Used

Elimination

Application:

�� First identify aromatic nature, then decide simple or mixed.

Final Logic:

�� Same phenyl groups = simple aromatic amine.

🧠 Memory Trick

Same phenyl = simple aromatic

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: Simple and Mixed Amines

7 The fundamental multiplicative prefix unit utilized to mathematically indicate three identical methyl groups attached to the nitrogen atom in a common name is:

A Mono

B Di

C Tri

D Tetra

💡 Short Explanation

�� Three identical groups are indicated by "tri". �� Example: Trimethylamine. �� "Di" indicates two groups.

✅ Correct Answer Explanation

In common nomenclature, the prefix "tri" is used when three identical alkyl groups are attached to nitrogen. Therefore, three methyl groups attached to nitrogen give trimethylamine.

❓ Why Other Options Are Incorrect

�� Option A → Mono indicates one group.
�� Option B → Di indicates two groups.
�� Option D → Tetra indicates four groups.

🎯 Strategy

Used

Dimensional/Unit Analysis

Application:

�� Match numerical prefix with group count.

Final Logic:

�� Three groups require "tri".

🧠 Memory Trick

Tri = Three

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: Common Naming of Tertiary Amines

8 In the systematically derived IUPAC name N,N-Dimethylmethanamine, why is the parent chain designated strictly as methanamine?

A It represents the longest carbon chain.

B All attached alkyl groups are methyls, forcing the one-carbon parent base.

C It is determined strictly by alphabetical priority.

D It is an exception to standard naming rules.

💡 Short Explanation

�� All groups attached to nitrogen are methyl groups. �� The parent amine base is methanamine. �� Other methyl groups are named as N-substituents.

✅ Correct Answer Explanation

N,N-Dimethylmethanamine contains three methyl groups attached to nitrogen. In IUPAC naming, one methyl group is taken as the parent methanamine unit, and the remaining two methyl groups are shown as N,N-dimethyl substituents. Therefore, the parent base is methanamine.

❓ Why Other Options Are Incorrect

�� Option A → There is no longer carbon chain present.
�� Option C → Alphabetical priority does not decide the parent chain here.
�� Option D → It follows standard IUPAC naming rules, not an exception.

🎯 Strategy

Used

Substitution

Application:

�� Identify the alkyl groups attached to nitrogen and choose the parent amine.

Final Logic:

�� All groups are methyl; hence the parent base is methanamine.

🧠 Memory Trick

All methyl → methanamine base

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: IUPAC Nomenclature of Tertiary Amines

List 1 (Parent Alkane Hydrocarbon)	List 2 (IUPAC Primary Amine Suffix Name)
1. Ethane	a. Butanamine
2. Propane	b. Propanamine
3. Butane	c. Ethanamine
4. Methane	d. Methanamine

A 1-c, 2-b, 3-a, 4-d

B 1-a, 2-b, 3-c, 4-d

C 1-b, 2-a, 3-d, 4-c

D 1-c, 2-a, 3-b, 4-d

💡 Short Explanation

�� Ethane gives Ethanamine. �� Propane gives Propanamine. �� Butane gives Butanamine. �� Methane gives Methanamine.

✅ Correct Answer Explanation

In IUPAC nomenclature, the final "e" of alkane is replaced by "amine". Ethane → Ethanamine Propane → Propanamine Butane → Butanamine Methane → Methanamine Thus, the correct matching is: 1-c, 2-b, 3-a, 4-d

❓ Why Other Options Are Incorrect

�� Option B → Ethane is incorrectly matched with Butanamine.
�� Option C → Ethane and Propane are incorrectly matched.
�� Option D → Propane and Butane are interchanged.

🎯 Strategy

Used

Option Grouping

Application:

�� Convert each alkane into its corresponding amine by replacing final "e".

Final Logic:

�� Alkane minus "e" + amine gives the correct IUPAC amine name.

🧠 Memory Trick

Drop e, add amine

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: IUPAC Nomenclature of Primary Amines

10 Why is the letter 'e' specifically retained in the IUPAC name ethane-1,2-diamine but systematically dropped in ethanamine?

A Because it acts as a secondary amine.

B Because the applied suffix 'diamine' begins with a consonant, preventing vowel clash.

C Because of specific hydrogen bonding forces.

D Because it is an aromatic compound.

💡 Short Explanation

�� In simple amines, final "e" is dropped before amine. �� In polyamines, "e" is retained. �� Diamine begins with a consonant sound.

✅ Correct Answer Explanation

In simple primary amines, the terminal "e" of alkane is replaced by "amine", as in ethane → ethanamine. However, when more than one amino group is present, prefixes such as di or tri are used, and the terminal "e" of the hydrocarbon is retained, as in ethane-1,2-diamine.

❓ Why Other Options Are Incorrect

�� Option A → Ethane-1,2-diamine is not named this way because it is secondary.
�� Option C → Hydrogen bonding does not decide nomenclature.
�� Option D → Ethane-1,2-diamine is not aromatic.

🎯 Strategy

Used

Elimination

Application:

�� Eliminate options based on chemical property and focus on nomenclature rule.

Final Logic:

�� Polyamine naming retains "e", while simple amine naming drops it.

🧠 Memory Trick

Diamine keeps "e"

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: IUPAC Nomenclature of Polyamines

11 Deduce the fully structured IUPAC name for the branched primary amine commonly known as Isopropylamine.

A Propan-1-amine

B Propan-2-amine

C Aminopropane

D Dimethylamine

💡 Short Explanation

�� Isopropyl group is attached through the second carbon. �� NH₂ is attached to carbon-2 of propane. �� Therefore, the IUPAC name is Propan-2-amine.

✅ Correct Answer Explanation

Isopropylamine has the structure: CH₃–CH(NH₂)–CH₃ The parent chain contains three carbon atoms (propane). The amino group is attached to the second carbon atom. Hence, according to IUPAC nomenclature, the correct name is: Propan-2-amine

❓ Why Other Options Are Incorrect

Option A → Propan-1-amine corresponds to n-propylamine.
Option C → Not the preferred IUPAC nomenclature.
Option D → Dimethylamine is a secondary amine with a different structure.

🎯 Strategy

Used

Substitution

Application:

�� Identify the carbon atom carrying the NH₂ group.

Final Logic:

�� NH₂ attached to carbon-2 gives Propan-2-amine.

🧠 Memory Trick

Iso = Middle Carbon

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: IUPAC Nomenclature of Primary Amines

12 Identify the foundational structural classification of Methanamine (CH₃NH₂) within organic systems.

A Primary aliphatic amine

B Secondary aliphatic amine

C Tertiary aliphatic amine

D Primary aromatic amine

💡 Short Explanation

�� NH₂ is attached to one alkyl group. �� Carbon chain is aliphatic. �� Therefore, it is a primary aliphatic amine.

✅ Correct Answer Explanation

Methanamine (CH₃NH₂) contains one methyl group attached to nitrogen and two hydrogen atoms remain attached to nitrogen. Thus, it is a primary amine. Since the methyl group is aliphatic rather than aromatic, it is classified as a primary aliphatic amine.

❓ Why Other Options Are Incorrect

Option B → Secondary amines contain two carbon-containing substituents.
Option C → Tertiary amines contain three carbon-containing substituents.
Option D → Aromatic amines require direct attachment to an aromatic ring.

🎯 Strategy

Used

Elimination

Application:

�� Count the number of carbon-containing groups attached to nitrogen.

Final Logic:

�� One alkyl group + NH₂ = Primary aliphatic amine.

🧠 Memory Trick

One Carbon Group = Primary

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: Classification of Amines

13 Arrange the following polyamines in increasing numerical order of the total amino groups they structurally possess:
(A) Propan-1-amine
(B) Hexane-1,6-diamine
(C) Propane-1,2,3-triamine

A (A), (B), (C)

B (B), (A), (C)

C (C), (A), (B)

D (B), (C), (A)

💡 Short Explanation

�� Propan-1-amine contains one NH₂ group. �� Hexane-1,6-diamine contains two NH₂ groups. �� Propane-1,2,3-triamine contains three NH₂ groups.

✅ Correct Answer Explanation

Number of amino groups: Propan-1-amine = 1 amino group Hexane-1,6-diamine = 2 amino groups Propane-1,2,3-triamine = 3 amino groups Therefore, increasing order: (A) < (B) < (C)

❓ Why Other Options Are Incorrect

Option B → Places diamine before monoamine.
Option C → Starts with the highest amino-group count.
Option D → Does not follow increasing order.

🎯 Strategy

Used

Ordering

Application:

�� Count the amino groups from the suffixes amine, diamine and triamine.

Final Logic:

�� 1 < 2 < 3 amino groups.

🧠 Memory Trick

Amine → Diamine → Triamine

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: Polyamines

14 Analyze the nomenclature framework for complex polyamines:
(A) The exact positions of amino groups are specified by numbering the parent chain.
(B) Appropriate prefixes like di, tri are attached directly to the word amine.
(C) The suffix 'e' of the primary hydrocarbon is always dropped regardless of the prefix.

A A and B only

B B and C only

C A and C only

D A, B, and C

💡 Short Explanation

�� Positions are indicated using locants. �� Prefixes such as di and tri are used. �� The final "e" is retained in polyamines.

✅ Correct Answer Explanation

Statement A is correct because the carbon atoms bearing amino groups are numbered. → Statement B is correct because prefixes such as di-, tri-, etc. are attached before amine. → Statement C is incorrect because, in polyamines such as ethane-1,2-diamine, the terminal "e" is retained. Therefore, only Statements A and B are correct.

❓ Why Other Options Are Incorrect

Option B → Includes incorrect Statement C.
Option C → Includes incorrect Statement C.
Option D → Statement C is false.

🎯 Strategy

Used

Option Grouping

Application:

�� Verify each nomenclature rule independently.

Final Logic:

�� Polyamines retain "e" and use numbering plus multiplicative prefixes.

🧠 Memory Trick

Many NH₂ → Keep "e"

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: Nomenclature of Polyamines

15 In rigorous IUPAC nomenclature, what structural relationship does the capitalized locant 'N' specifically specify?

A A substituent situated on the main carbon chain

B A substituent attached directly to the central nitrogen atom

C The presence of an oxidized nitro group

D The total molecular count of nitrogens

💡 Short Explanation

�� N-locants indicate substitution on nitrogen. �� They distinguish nitrogen substitution from carbon substitution. �� Common in secondary and tertiary amines.

✅ Correct Answer Explanation

In IUPAC nomenclature, the locant N specifies that a substituent is attached directly to the nitrogen atom rather than to a carbon atom of the parent chain. Example: N-Methylethanamine Here, the methyl group is attached to nitrogen. Thus, N indicates substitution on the nitrogen atom.

❓ Why Other Options Are Incorrect

Option A → Carbon-chain substitutions use numerical locants such as 1, 2, or 3.
Option C → N has no relation to nitro groups.
Option D → N does not indicate the number of nitrogen atoms.

🎯 Strategy

Used

Contextual/Tonal Matching

Application:

�� Recall the specific role of N-locants in amine nomenclature.

Final Logic:

�� N directly identifies substitution on nitrogen.

🧠 Memory Trick

N = On Nitrogen

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: Nitrogen Locants in IUPAC Nomenclature

List 1 (N-Substituted Amine Structure)	List 2 (Correct IUPAC Name)
1. CH₃NHCH₂CH₃	a. N,N-Diethylethanamine
2. (CH₃CH₂)₃N	b. N-Methylethanamine
3. (CH₃)₃N	c. N,N-Dimethylmethanamine
4. CH₃NHCH₃	d. N-Methylmethanamine

A 1-b, 2-a, 3-c, 4-d

B 1-a, 2-b, 3-d, 4-c

C 1-c, 2-d, 3-a, 4-b

D 1-d, 2-c, 3-b, 4-a

💡 Short Explanation

�� CH₃NHCH₂CH₃ is N-Methylethanamine. �� (CH₃CH₂)₃N is N,N-Diethylethanamine. �� (CH₃)₃N is N,N-Dimethylmethanamine.

✅ Correct Answer Explanation

CH₃NHCH₂CH₃ contains methyl and ethyl groups attached to nitrogen. The parent chain is ethanamine, and methyl is attached to nitrogen; hence it is N-Methylethanamine. → (CH₃CH₂)₃N contains three ethyl groups. One ethyl group forms the parent ethanamine, and the other two ethyl groups are N-substituents; hence it is N,N-Diethylethanamine. → (CH₃)₃N contains three methyl groups. One methyl group forms the parent methanamine, and the other two are N-substituents; hence it is N,N-Dimethylmethanamine. → CH₃NHCH₃ contains two methyl groups and is named N-Methylmethanamine.

❓ Why Other Options Are Incorrect

�� Option B → Interchanges the names of CH₃NHCH₂CH₃ and (CH₃CH₂)₃N.
�� Option C → Incorrectly matches all major N-substituted structures.
�� Option D → Incorrectly assigns CH₃NHCH₂CH₃ as N-Methylmethanamine and reverses other matches.

🎯 Strategy

Used

Option Grouping

Application:

�� Identify the parent alkylamine first, then assign remaining alkyl groups as N-substituents.

Final Logic:

�� Parent chain + substituents on nitrogen gives the correct N-locant name.

🧠 Memory Trick

N means group is on nitrogen

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: N-Locant Nomenclature of Amines

17 Based on the IUPAC substitution rules, what is the precise name for o-Toluidine?

A 2-Methylaniline

B 3-Methylaniline

C 4-Methylaniline

D Benzylamine

💡 Short Explanation

�� o-Toluidine means ortho-methyl aniline. �� Ortho position corresponds to 2-position. �� Therefore, its IUPAC name is 2-Methylaniline.

✅ Correct Answer Explanation

o-Toluidine is an aniline derivative in which a methyl group is present at the ortho position with respect to the –NH₂ group. In IUPAC numerical locants, the ortho position is represented by carbon-2. Hence, o-Toluidine is named 2-Methylaniline.

❓ Why Other Options Are Incorrect

�� Option B → 3-Methylaniline corresponds to m-Toluidine.
�� Option C → 4-Methylaniline corresponds to p-Toluidine.
�� Option D → Benzylamine has –NH₂ attached to –CH₂– next to benzene, not directly as aniline.

🎯 Strategy

Used

Elimination

Application:

�� Convert common position descriptor "ortho" into its IUPAC numerical locant.

Final Logic:

�� Ortho = 2-position, so o-Toluidine = 2-Methylaniline.

🧠 Memory Trick

Ortho = 2

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: Nomenclature of Substituted Arylamines

18 When a heavy bromine atom substitutes at the para position relative to the –NH₂ group on a benzene ring, what is the exact IUPAC numerical position of that bromine atom?

A 1

B 2

C 3

D 4

💡 Short Explanation

�� Para position means opposite position on benzene. �� In disubstituted benzene, para corresponds to 1,4 relationship. �� Hence bromine is at position 4.

✅ Correct Answer Explanation

In aniline derivatives, the carbon attached to –NH₂ is taken as position 1. If bromine is at the para position relative to –NH₂, it lies opposite to the amino group on the benzene ring. This corresponds to carbon-4. Therefore, the exact numerical position is 4.

❓ Why Other Options Are Incorrect

�� Option A → Position 1 is occupied by the –NH₂ group.
�� Option B → Position 2 corresponds to ortho substitution.
�� Option C → Position 3 corresponds to meta substitution.

🎯 Strategy

Used

Substitution

Application:

�� Convert para notation into numerical benzene-ring position.

Final Logic:

�� Para = 4-position.

🧠 Memory Trick

Para = Opposite = 4

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: Ortho Meta Para Nomenclature

19 Analytically evaluate these comparative statements drawn from Table 9.1:
(A) Allylamine accurately translates to Prop-2-en-1-amine.
(B) N,N-Diethylbutylamine properly utilizes the four-carbon butyl chain as its IUPAC parent base.
(C) Aniline strictly categorizes as an aliphatic alkylamine.

A A and B only

B B and C only

C A and C only

D A, B, and C

💡 Short Explanation

�� Allylamine is Prop-2-en-1-amine. �� N,N-Diethylbutylamine uses butan-1-amine as parent base. �� Aniline is aromatic, not aliphatic.

✅ Correct Answer Explanation

Statement A is correct because allylamine corresponds to Prop-2-en-1-amine, an unsaturated primary aliphatic amine. → Statement B is correct because in N,N-Diethylbutylamine, the butyl group forms the longest parent chain and is named as butan-1-amine, while two ethyl groups are shown as N,N-diethyl substituents. → Statement C is incorrect because aniline is an aromatic arylamine, not an aliphatic alkylamine.

❓ Why Other Options Are Incorrect

�� Option B → Includes Statement C, which is incorrect.
�� Option C → Includes Statement C and omits Statement B.
�� Option D → Includes incorrect Statement C.

🎯 Strategy

Used

Option Grouping

Application:

�� Verify each statement using classification and IUPAC naming rules.

Final Logic:

�� Allylamine and N,N-Diethylbutylamine statements are correct; aniline is aromatic.

🧠 Memory Trick

Aniline = Aryl, not Alkyl

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: Table 9.1 Nomenclature and Classification

20 Arrange the following compounds from Table 9.1 structurally in increasing order of their total molecular carbon atoms:
(A) Methanamine
(B) Ethanamine
(C) Propan-1-amine

A (A), (B), (C)

B (B), (A), (C)

C (C), (B), (A)

D (A), (C), (B)

💡 Short Explanation

�� Methanamine has one carbon. �� Ethanamine has two carbons. �� Propan-1-amine has three carbons.

✅ Correct Answer Explanation

Count total carbon atoms in each compound: → Methanamine = CH₃NH₂ = 1 carbon → Ethanamine = CH₃CH₂NH₂ = 2 carbons → Propan-1-amine = CH₃CH₂CH₂NH₂ = 3 carbons Thus, increasing order is: (A), (B), (C)

❓ Why Other Options Are Incorrect

�� Option B → Places Ethanamine before Methanamine.
�� Option C → Gives decreasing order.
�� Option D → Places Propan-1-amine before Ethanamine.

🎯 Strategy

Used

Ordering

Application:

�� Count the carbon atoms in each IUPAC name.

Final Logic:

�� Meth = 1C, Eth = 2C, Prop = 3C.

🧠 Memory Trick

Meth 1, Eth 2, Prop 3

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: IUPAC Names and Carbon Chain Length

CUET UG Chemistry Booster Test – 1 Nomenclature of Amines

CUET UG Chemistry Booster Test - 1 Nomenclature of Amines

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