CUET UG Chemistry Booster Test - 2 Nomenclature of Amines -

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CUET UG Chemistry Booster Test - 2 Nomenclature of Amines

⏱️ 30 Minutes

❓ 20 Questions

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

CUET UG Chemistry Booster Test - 2 Nomenclature of Amines

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QUESTION 1 OF 20

📄 Passage

In IUPAC system, primary amines are named as alkanamines. The name is derived by replacement of 'e' of alkane by the word amine. For example, CH₃NH₂ is named as methanamine. In case, more than one amino group is present at different positions in the parent chain, their positions are specified by giving numbers to the carbon atoms bearing –NH₂ groups and suitable prefix such as di, tri, etc. is attached to the amine. The letter 'e' of the suffix of the hydrocarbon part is retained.

According to the passage, the base IUPAC name of a primary amine is derived by replacing the 'e' of the alkane with which specific word?

Answer Review

📄 Passage

According to the passage, the base IUPAC name of a primary amine is derived by replacing the 'e' of the alkane with which specific word?

A Amine

B Alkanamine

C Amino

D Ammonia

💡 Short Explanation

�� Primary amines are named as alkanamines. �� The final "e" of alkane is replaced. �� The replacement word is "amine".

✅ Correct Answer Explanation

According to IUPAC nomenclature, primary amines are named by replacing the terminal "e" of the parent alkane with the word "amine". Example: Methane → Methanamine Thus, the specific replacement word is amine.

❓ Why Other Options Are Incorrect

�� Option B → Alkanamine is the resulting name pattern, not the replacement word.
�� Option C → Amino is used as a prefix in some naming situations.
�� Option D → Ammonia is the parent compound, not a nomenclature suffix.

🎯 Strategy

Used

Contextual/Tonal Matching

Application:

�� Locate the exact nomenclature statement from the passage.

Final Logic:

�� Alkane → replace "e" with "amine".

🧠 Memory Trick

Drop e, Add amine

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

📄 Passage

Based on the passage, how are the specific positions of multiple amino groups definitively specified within the parent chain?

A Using ortho, meta, and para descriptors

B By giving numbers to the carbon atoms bearing the –NH₂ groups

C By employing N-locants sequentially

D Alphabetically

💡 Short Explanation

�� Polyamines require locants. �� Carbon atoms carrying NH₂ groups are numbered. �� These numbers specify positions.

✅ Correct Answer Explanation

For compounds containing more than one amino group, IUPAC nomenclature specifies the position of each amino group by assigning numbers to the carbon atoms bearing the –NH₂ groups. Example: Ethane-1,2-diamine The numbers 1 and 2 indicate the positions of the amino groups.

❓ Why Other Options Are Incorrect

�� Option A → Used in common nomenclature of aromatic compounds.
�� Option C → N-locants identify substitution on nitrogen.
�� Option D → Alphabetical order is not used for positional specification.

🎯 Strategy

Used

Contextual/Tonal Matching

Application:

�� Use the exact rule given in the passage.

Final Logic:

�� Positions are identified using carbon-number locants.

🧠 Memory Trick

Many NH₂ → Number the Carbons

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

3 Analyze the conventions for common naming of aliphatic amines:
(A) The alkyl group is written as a prefix to the word amine.
(B) Methylamine represents a properly formatted one-word name.
(C) For simple amines, the format utilizes alkane bases rather than alkyl groups.

A A, B, and C

B B and C only

C A and C only

D A and B only

💡 Short Explanation

�� Common names use alkyl groups. �� Names are written as one word. �� Alkane bases belong to IUPAC naming.

✅ Correct Answer Explanation

Statement A is correct because common nomenclature places the alkyl group before the word amine. → Statement B is correct because methylamine is written as one word. → Statement C is incorrect because common nomenclature uses alkyl groups, whereas alkane bases are used in IUPAC nomenclature.

❓ Why Other Options Are Incorrect

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

🎯 Strategy

Used

Option Grouping

Application:

�� Separate common nomenclature from IUPAC nomenclature.

Final Logic:

�� Only Statements A and B describe common naming correctly.

🧠 Memory Trick

Common = Alkyl + Amine

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

4 Arrange these primary amines in increasing order of their parent carbon chain length:
(A) Methylamine
(B) Ethylamine
(C) n-Propylamine
(D) Hexamethylenediamine

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

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

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

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

💡 Short Explanation

�� Methylamine has 1 carbon. �� Ethylamine has 2 carbons. �� n-Propylamine has 3 carbons.

✅ Correct Answer Explanation

Parent chain lengths: → Methylamine = 1 carbon → Ethylamine = 2 carbons → n-Propylamine = 3 carbons → Hexamethylenediamine = 6 carbons Increasing order: (A), (B), (C), (D)

❓ Why Other Options Are Incorrect

�� Options B, C and D do not follow increasing carbon count.

🎯 Strategy

Used

Substitution

Application:

�� Count carbon atoms in each parent chain.

Final Logic:

�� 1 < 2 < 3 < 6.

🧠 Memory Trick

Methyl < Ethyl < Propyl < Hexyl

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

5 Deduce the accurate common name for the structural formula (CH₃CH₂)₂NH.

A Diethylamine

B Diethanamine

C Ethylmethylamine

D N-Ethylethanamine

💡 Short Explanation

�� Two identical ethyl groups are attached to nitrogen. �� Secondary amine. �� Common prefix used is "di".

✅ Correct Answer Explanation

The structure contains two identical ethyl groups attached to nitrogen. (CH₃CH₂)₂NH According to common nomenclature, two identical alkyl groups are indicated by the prefix "di". Hence the name is Diethylamine.

❓ Why Other Options Are Incorrect

�� Option B → Not the common name.
�� Option C → Requires one methyl and one ethyl group.
�� Option D → Represents an IUPAC-style naming pattern.

🎯 Strategy

Used

Substitution

Application:

�� Count identical alkyl groups attached to nitrogen.

Final Logic:

�� Two ethyl groups = Diethylamine.

🧠 Memory Trick

2 Ethyl = Diethyl

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

6 The presence of two identical, repeated alkyl groups attached directly to the nitrogen of a secondary amine chemically categorizes it as a:

A Simple amine

B Mixed amine

C Tertiary amine

D Quaternary salt

💡 Short Explanation

�� Identical groups indicate a simple amine. �� Different groups indicate a mixed amine. �� The amine remains secondary.

✅ Correct Answer Explanation

Secondary amines containing two identical alkyl groups attached to nitrogen are called simple secondary amines. Example: (CH₃)₂NH → Dimethylamine Since both substituents are identical, the compound is simple rather than mixed.

❓ Why Other Options Are Incorrect

�� Option B → Mixed amines contain different groups.
�� Option C → Secondary amine is not tertiary.
�� Option D → Quaternary salts contain four substituents.

🎯 Strategy

Used

Odd One Out

Application:

�� Focus on whether substituent groups are identical or different.

Final Logic:

�� Identical alkyl groups produce a simple amine.

🧠 Memory Trick

Same Groups = Simple

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

7 Question: Match the Following

List I (Structural Formula)	List II (Common Name)
1. (CH₃)NH₂	a. Triethylamine
2. (C₂H₅)NH₂	b. Dimethylamine
3. (CH₃)₂NH	c. Methylamine
4. (C₂H₅)₃N	d. Ethylamine

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

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

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

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

💡 Short Explanation

One CH₃ group attached to NH₂ → Methylamine One C₂H₅ group attached to NH₂ → Ethylamine Two CH₃ groups attached to NH → Dimethylamine Three C₂H₅ groups attached to N → Triethylamine

✅ Correct Answer Explanation

1. (CH₃)NH₂ → Methylamine (c) Contains one methyl group (CH₃–) attached to the amino group. 2. (C₂H₅)NH₂ → Ethylamine (d) Contains one ethyl group (C₂H₅–) attached to the amino group. 3. (CH₃)₂NH → Dimethylamine (b) Contains two methyl groups attached to nitrogen. 4. (C₂H₅)₃N → Triethylamine (a) Contains three ethyl groups attached to nitrogen. Correct Matching: 1-c, 2-d, 3-b, 4-a

❓ Why Other Options Are Incorrect

Option B: Interchanges methyl and ethyl groups and incorrectly identifies tertiary amine.
Option C: Confuses dimethylamine with ethylamine.
Option D: Incorrectly identifies methylamine as dimethylamine.

🎯 Strategy

Used

Option Grouping

Application:

Count the number of alkyl groups attached to nitrogen.
Identify whether the alkyl group is methyl (CH₃) or ethyl (C₂H₅).

Final Logic:

One methyl group → Methylamine
One ethyl group → Ethylamine
Two methyl groups → Dimethylamine
Three ethyl groups → Triethylamine

🧠 Memory Trick

(C₂H₅)₃N → Tri + Ethyl = Triethylamine

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

8 A tertiary amine defined by the presence of three entirely different alkyl groups attached to the nitrogen is formally referred to as:

A A simple amine

B A mixed amine

C A symmetric amine

D A polyamine

💡 Short Explanation

�� Different groups indicate mixed amines. �� Three groups indicate tertiary amines. �� Hence mixed tertiary amine.

✅ Correct Answer Explanation

When nitrogen is attached to three different alkyl groups, the amine is classified as mixed because the substituents are not identical.

❓ Why Other Options Are Incorrect

�� Option A → Simple amines have identical groups.
�� Option C → Symmetric means identical substituents.
�� Option D → Polyamines contain multiple amino groups.

🎯 Strategy

Used

Elimination

Application:

�� Identify whether the attached groups are identical or different.

Final Logic:

�� Three different groups produce a mixed amine.

🧠 Memory Trick

Different = Mixed

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

9 When identifying the structural suffix unit applied to the hydrocarbon parent name in the IUPAC system for CH₃CH₂CH₂NH₂, the correct unit is:

A -ane

B -amine

C -ol

D -oic acid

💡 Short Explanation

�� Primary amines use the suffix amine. �� Parent chain is propane. �� Resulting name is propan-1-amine.

✅ Correct Answer Explanation

The functional group present is –NH₂. Therefore, the suffix used in IUPAC nomenclature is amine. CH₃CH₂CH₂NH₂ → Propan-1-amine

❓ Why Other Options Are Incorrect

�� Option A → Represents alkane.
�� Option C → Used for alcohols.
�� Option D → Used for carboxylic acids.

🎯 Strategy

Used

Dimensional/Unit Analysis

Application:

�� Identify the functional group and its suffix.

Final Logic:

�� NH₂ corresponds to the suffix amine.

🧠 Memory Trick

NH₂ = Amine

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

10 The IUPAC name "propan-2-amine" specifically indicates that the primary amino group is attached to which numerical carbon of the propane chain?

A First carbon

B Second carbon

C Third carbon

D Nitrogen

💡 Short Explanation

�� The locant "2" indicates position. �� Parent chain contains three carbons. �� NH₂ is attached to carbon-2.

✅ Correct Answer Explanation

In IUPAC nomenclature, the number before the suffix specifies the carbon atom bearing the amino group. Therefore, in propan-2-amine, the amino group is attached to the second carbon atom of propane.

❓ Why Other Options Are Incorrect

�� Option A → Corresponds to propan-1-amine.
�� Option C → Not represented by the locant 2.
�� Option D → Locants refer to carbon atoms, not nitrogen.

🎯 Strategy

Used

Substitution

Application:

�� Interpret the locant appearing in the IUPAC name.

Final Logic:

�� The locant 2 identifies the second carbon atom.

🧠 Memory Trick

Number = Carbon Position

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

11 Provide the accepted IUPAC name for the simplest primary amine, CH₃NH₂.

A Methylamine

B Methanamine

C Aminomethane

D Ammonia

💡 Short Explanation

�� CH₃NH₂ contains one carbon atom. �� Parent hydrocarbon is methane. �� IUPAC name is Methanamine.

✅ Correct Answer Explanation

According to IUPAC nomenclature, primary amines are named by replacing the terminal "e" of the parent alkane with the suffix "amine". Methane → Methanamine Therefore, CH₃NH₂ is correctly named Methanamine.

❓ Why Other Options Are Incorrect

�� Option A → Methylamine is the common name.
�� Option C → Not the preferred IUPAC nomenclature used in NCERT.
�� Option D → Ammonia is NH₃, not CH₃NH₂.

🎯 Strategy

Used

Substitution

Application:

�� Replace the final "e" of methane with "amine".

Final Logic:

�� Methane + amine → Methanamine.

🧠 Memory Trick

Methane → Methanamine

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

12 What is the systematic IUPAC name corresponding to the common name Hexamethylenediamine?

A Hexane-1,6-diamine

B Hexanamine

C 1,6-Aminohexane

D Hexaminoethane

💡 Short Explanation

�� Parent chain contains six carbon atoms. �� Amino groups are present at C-1 and C-6. �� Hence, Hexane-1,6-diamine.

✅ Correct Answer Explanation

Hexamethylenediamine has the structure: H₂N-(CH₂)₆-NH₂ The parent chain is hexane. Two amino groups are attached at carbon-1 and carbon-6. According to IUPAC rules, the name becomes: Hexane-1,6-diamine

❓ Why Other Options Are Incorrect

�� Option B → Indicates only one amino group.
�� Option C → Not the preferred IUPAC form.
�� Option D → Incorrect parent chain and functional group placement.

🎯 Strategy

Used

Substitution

Application:

�� Identify parent chain length and amino group positions.

Final Logic:

�� Six-carbon chain with NH₂ at positions 1 and 6 gives Hexane-1,6-diamine.

🧠 Memory Trick

Hexa + 1,6 = Diamine

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

13 Evaluate the statements regarding Nitrogen Locants:
(A) They are utilized to designate substituents attached directly to the nitrogen atom.
(B) N-Methylethanamine describes a secondary amine.
(C) They are functionally required when naming unbranched primary amines.

A A and B only

B B and C only

C A and C only

D A, B, and C

💡 Short Explanation

�� N-locants indicate substitution on nitrogen. �� N-Methylethanamine is a secondary amine. �� Simple primary amines do not require N-locants.

✅ Correct Answer Explanation

Statement A is correct because N-locants specify substituents attached directly to the nitrogen atom rather than to a carbon atom. → Statement B is correct because N-Methylethanamine contains a methyl group and an ethyl group attached to nitrogen, making it a secondary amine. → Statement C is incorrect because unbranched primary amines such as ethanamine and methanamine do not require N-locants. Therefore, only Statements A and B are correct.

❓ Why Other Options Are Incorrect

�� Option B → Includes Statement C, which is incorrect.
�� Option C → Omits Statement B.
�� Option D → Statement C is false.

🎯 Strategy

Used

Option Grouping

Application:

�� Verify each statement independently using IUPAC nomenclature rules.

Final Logic:

�� N-locants are used for nitrogen substitution, not for simple primary amines.

🧠 Memory Trick

N Means "On Nitrogen"

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

14 What is the structurally correct IUPAC name for the compound (CH₃CH₂)₃N?

A N,N-Diethylethanamine

B Triethylamine

C N-Ethyl-N-methylamine

D Diethylaminoethane

💡 Short Explanation

�� Nitrogen is attached to three ethyl groups. �� One ethyl group is chosen as parent ethanamine. �� Two remaining ethyl groups become N-substituents.

✅ Correct Answer Explanation

The structure (CH₃CH₂)₃N contains three identical ethyl groups attached to nitrogen. For IUPAC naming: One ethyl group forms the parent chain (ethanamine). The other two ethyl groups are treated as substituents on nitrogen. Therefore: N,N-Diethylethanamine is the preferred IUPAC name.

❓ Why Other Options Are Incorrect

�� Option B → Triethylamine is the common name.
�� Option C → Contains both ethyl and methyl substituents, which is incorrect.
�� Option D → Not the preferred IUPAC nomenclature.

🎯 Strategy

Used

Substitution

Application:

�� Select one alkyl group as parent and place remaining groups as N-substituents.

Final Logic:

�� Ethanamine parent + two N-ethyl substituents = N,N-Diethylethanamine.

🧠 Memory Trick

3 Ethyls → Parent + N,N-Diethyl

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

List 1 (Parent Amine Compound)	List 2 (Classification Type)
1. C₆H₅NH₂	a. Primary Arylamine
2. CH₃NH₂	b. Primary Alkylamine
3. C₂H₅NH₂	c. Primary Alkylamine
4. C₆H₅CH₂NH₂	d. Primary Aralkylamine

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

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

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

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

💡 Short Explanation

�� C₆H₅NH₂ is Aniline, a primary arylamine. �� CH₃NH₂ and C₂H₅NH₂ are primary alkylamines. �� C₆H₅CH₂NH₂ is a primary aralkylamine because NH₂ is attached through a methylene group.

✅ Correct Answer Explanation

C₆H₅NH₂ (Aniline) contains an amino group directly attached to a benzene ring. Therefore, it is classified as a Primary Arylamine. → CH₃NH₂ (Methanamine/Methylamine) contains the amino group attached to a methyl group. Hence, it is a Primary Alkylamine. → C₂H₅NH₂ (Ethanamine/Ethylamine) contains the amino group attached to an ethyl group. Therefore, it is also a Primary Alkylamine. → C₆H₅CH₂NH₂ (Benzylamine) has the amino group attached to a carbon atom adjacent to a benzene ring rather than directly to the ring. Hence, it is classified as a Primary Aralkylamine. Therefore, the correct matching is: 1-a, 2-b, 3-c, 4-d

❓ Why Other Options Are Incorrect

Option B → Incorrect because C₆H₅NH₂ is not a primary alkylamine and C₆H₅CH₂NH₂ is not a primary arylamine.
Option C → Incorrect because CH₃NH₂ is not a primary aralkylamine and C₂H₅NH₂ is not a primary arylamine.
Option D → Incorrect because C₆H₅NH₂ is not a primary aralkylamine and CH₃NH₂ is not a primary arylamine.

🎯 Strategy

Used

Option Grouping

Application:

�� First identify whether the amino group is attached directly to an aromatic ring, an alkyl group, or a benzylic carbon.
�� Then classify as arylamine, alkylamine, or aralkylamine.

Final Logic:

�� Direct attachment to benzene gives arylamine; attachment to alkyl carbon gives alkylamine; attachment through –CH₂– to benzene gives aralkylamine.

🧠 Memory Trick

Aralkyl = NH₂ one carbon away from ring

📚 Class XII – Chemistry Part II – Chapter: Amines – Topic: Classification of Alkylamines, Arylamines and Aralkylamines

16 In the class of compounds known as arylamines, the –NH₂ group is directly attached to which primary structure?

A An aliphatic alkyl chain

B A benzene ring

C A cyclohexane ring

D A double bond

💡 Short Explanation

�� Arylamines contain aromatic rings. �� The amino group is directly attached to the aromatic ring. �� Aniline is the simplest example.

✅ Correct Answer Explanation

Arylamines are aromatic amines in which the amino group (–NH₂) is attached directly to an aromatic ring, most commonly a benzene ring. Example: C₆H₅NH₂ (Aniline) Since the amino group is bonded directly to the benzene ring carbon, the compound is classified as an arylamine.

❓ Why Other Options Are Incorrect

Option A → Represents alkylamines, where NH₂ is attached to an aliphatic carbon chain.
Option C → Cyclohexane is non-aromatic and therefore does not form an arylamine.
Option D → A carbon-carbon double bond alone does not define arylamines.

🎯 Strategy

Used

Odd One Out

Application:

�� Identify the characteristic feature of aromatic amines.

Final Logic:

�� Arylamines require direct attachment of NH₂ to an aromatic ring.

🧠 Memory Trick

Aryl = Aromatic Ring

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

List 1 (Common Name)	List 2 (IUPAC Equivalent)
1. o-Toluidine	a. 2-Methylaniline
2. p-Bromoaniline	b. 4-Bromobenzenamine
3. Aniline	c. Benzenamine
4. m-Toluidine	d. 3-Methylaniline

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

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

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

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

💡 Short Explanation

�� o = ortho = 2-position. �� m = meta = 3-position. �� p = para = 4-position.

✅ Correct Answer Explanation

o-Toluidine contains a methyl group at the ortho position relative to NH₂ and corresponds to 2-Methylaniline. → p-Bromoaniline contains bromine at the para position relative to NH₂ and corresponds to 4-Bromobenzenamine. → Aniline is the common name of Benzenamine. → m-Toluidine contains a methyl group at the meta position and corresponds to 3-Methylaniline. Correct matching: 1-a, 2-b, 3-c, 4-d

❓ Why Other Options Are Incorrect

Option B → Incorrectly interchanges ortho, para and benzenamine relationships.
Option C → Aniline is not 2-Methylaniline.
Option D → o-Toluidine is not 3-Methylaniline.

🎯 Strategy

Used

Option Grouping

Application:

�� Convert ortho/meta/para notation into numerical locants.

Final Logic:

�� o = 2, m = 3, p = 4.

🧠 Memory Trick

OMP = 2,3,4

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

18 Deduce the standard IUPAC name for the compound commonly known as p-Bromoaniline.

A 2-Bromobenzenamine

B 3-Bromobenzenamine

C 4-Bromobenzenamine

D Bromobenzene

💡 Short Explanation

�� Para position corresponds to 4-position. �� Parent compound is benzenamine. �� Bromine occupies carbon-4.

✅ Correct Answer Explanation

In p-Bromoaniline, the amino group is attached at carbon-1 of the benzene ring and bromine is attached at the para position. Para substitution corresponds to the 4-position. Hence the IUPAC name is: 4-Bromobenzenamine

❓ Why Other Options Are Incorrect

Option A → Represents ortho substitution.
Option B → Represents meta substitution.
Option D → Bromobenzene lacks the amino group.

🎯 Strategy

Used

Elimination

Application:

�� Convert para notation into its numerical equivalent.

Final Logic:

�� Para = 4-position.

🧠 Memory Trick

Para = Four

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

19 Arrange the following chemical structures in decreasing order of their comparative basicity in the aqueous phase:
(A) (C₂H₅)₂NH
(B) C₂H₅NH₂
(C) NH₃

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

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

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

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

💡 Short Explanation

�� Secondary amines are generally more basic than primary amines in water. �� Primary amines are more basic than ammonia. �� Alkyl groups increase electron density on nitrogen.

✅ Correct Answer Explanation

Basicity depends on the availability of the lone pair on nitrogen. → Ethyl groups donate electron density through the +I effect. → Diethylamine contains two electron-releasing ethyl groups, making its lone pair most available. → Ethylamine contains one ethyl group and is less basic than diethylamine. → Ammonia lacks electron-donating alkyl groups and is the least basic. Therefore: (C₂H₅)₂NH > C₂H₅NH₂ > NH₃

❓ Why Other Options Are Incorrect

Option B → Gives completely opposite order.
Option C → Incorrectly places primary amine above secondary amine.
Option D → Incorrectly places ammonia above ethylamine.

🎯 Strategy

Used

Ordering

Application:

�� Compare electron-donating alkyl groups attached to nitrogen.

Final Logic:

�� More +I effect → Greater basicity.

🧠 Memory Trick

2° > 1° > NH₃

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

20 Identify the structural classification of the compound N,N-Dimethylaniline,

A Primary arylamine

B Secondary arylamine

C Tertiary arylamine

D Primary alkylamine

💡 Short Explanation

�� Nitrogen is attached to one phenyl group and two methyl groups. �� Three carbon-containing groups are attached to nitrogen. �� Therefore, it is tertiary.

✅ Correct Answer Explanation

N,N-Dimethylaniline has the structure: C₆H₅N(CH₃)₂ Nitrogen is bonded to: • One phenyl group • Two methyl groups Since three carbon-containing groups are attached to nitrogen and no hydrogen remains attached to nitrogen, the compound is a tertiary amine. Since one substituent is aromatic, it is classified as a tertiary arylamine.

❓ Why Other Options Are Incorrect

Option A → Primary amines contain only one carbon-containing substituent on nitrogen.
Option B → Secondary amines contain two carbon-containing substituents.
Option D → The compound contains an aromatic ring and is not an alkylamine.

🎯 Strategy

Used

Substitution

Application:

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

Final Logic:

�� Three groups on nitrogen = tertiary amine.

🧠 Memory Trick

Aniline + Two Methyl = Tertiary

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

CUET UG Chemistry Booster Test – 2 Nomenclature of Amines

CUET UG Chemistry Booster Test - 2 Nomenclature of Amines

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