CHEMISTRY

AMINES

Question 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 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.

Question 3: How will you convert?
(i) Benzene into aniline
(ii) Benzene into N, N-dimethylaniline
(iii) Cl−(CH₂)₄−Cl into hexan-1, 6-diamine?

Answer :

(i)

(ii)

(iii)

Prepared By: Mr. MANISH TULI
mail to: [email protected]