INTRODUCTION - Chapter 13 - Amines - Intext Solutions - Ncert Solutions class 12 - Chemistry

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Question 13.1:

Classify the following amines as primary, secondary or tertiary:

(i)

(ii)

(iii) (C₂H₅)₂CHNH₂

(iv) (C₂H₅)₂NH

Answer:

Primary: (i) and (iii)

Secondary: (iv)

Tertiary: (ii)

Question 13.2:

(i) Write structures of different isomeric amines corresponding to the molecular formula, C₄H₁₁N

(ii) Write IUPAC names of all the isomers.

(iii) What type of isomerism is exhibited by different pairs of amines?

Answer:

(i), (ii) The structures and their IUPAC names of different isomeric amines corresponding to the molecular formula, C₄H₁₁N are given below:

(a) CH₃-CH₂-CH₂-CH₂-NH₂

Butanamine (1⁰)

(b) 

Butan-2-amine (1⁰)

(c) 

2-Methylpropanamine (1⁰)

(d)

2-Methylpropan-2-amine (1⁰)

(e) CH₃-CH₂-CH₂-NH-CH₃

N-Methylpropanamine (2⁰)

(f) CH₃-CH₂-NH-CH₂-CH₃

N-Ethylethanamine (2⁰)

(g)

N-Methylpropan-2-amine (2⁰)

(h)

N,N-Dimethylethanamine (3°)

(iii) The pairs (a) and (b) and (e) and (g) exhibit position isomerism.

The pairs (a) and (c); (a) and (d); (b) and (c); (b) and (d) exhibit chain isomerism.

The pairs (e) and (f) and (f) and (g) exhibit metamerism.

All primary amines exhibit functional isomerism with secondary and tertiary amines and vice-versa.