Unit 13 Amines (Intext Questions-1)
Intext Questions
13.1 Classify the following amines as primary, secondary or tertiary:
(iii) $\left({C_2} {H_5}\right)_{2} {CHNH_2} \quad$
(iv) $\left({C_2} {H_5}\right)_2 {NH}$
Show Answer
Answer
Primary: (i) and (iii)
Secondary: (iv)
Tertiary: (ii)
13.2 (i) Write structures of different isomeric amines corresponding to the molecular formula, ${C_4} {H_{11}} {~N}$.
(ii) Write IUPAC names of all the isomers.
(iii) What type of isomerism is exhibited by different pairs of amines?
Show Answer
Answer
(i), (ii) The structures and their IUPAC names of different isomeric amines corresponding to the molecular formula, ${C_4} {H_{11}}{N}$ are given below:
(a) ${CH_3}-{CH_2}-{CH_2}-{CH_2}-{NH_2}$
Butanamine $(1^\circ)$
(b)
Butan-2-amine $(1^\circ)$
(c)
2-Methylpropanamine $(1^\circ)$
(d)
2-Methylpropan-2-amine $(1^\circ)$
(e) ${CH_3}-{CH_2}-{CH_2}-{NH}-{CH_3}$
${N}$-Methylpropanamine $(2^\circ)$
(f) ${CH_3}-{CH_2}-{NH}-{CH_2}-{CH_3}$
${N}$-Ethylethanamine $(2^\circ)$
(g)
N-Methylpropan-2-amine $(2^\circ)$
${N}, {N}$-Dimethylethanamine $\left(3^{\circ}\right)$
(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 viceversa.
BETA
