Question
- Write structures of different isomeric amines corresponding to the molecular formula, $C_4H_{11}N.$
- Write $\text{IUPAC}$ names of all the isomers.
- What type of isomerism is exhibited by different pairs of amines?
✓
Answer
$(i) \& (ii)$ There are total $8$ geometrical isomers of the given compound.
$(iii) a)$ Pairs $1, 2, 6, 7$ Exhibit position isomerism:
| Isomers | IUPAC Name | |
| $1.$ | $\text{CH}_3-\text{CH}_2-\text{CH}_2-\text{CH}_2-\text{NH}_2$ | Butan$-1$ amine or butanamine |
| $2.$ | $ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{NH}_2\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{CH}_2-\text{CH}-\text{CH}_3$ | Butan $- 2 -$ amine. |
| $3.$ | $ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{CH}-\text{CH}_2-\text{NH}_2$ | $2 -$ Methylpropanamine |
| $4.$ | $ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{C}-\text{NH}_2\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$ | $2 -$ Methylpropan $- 2 -$ amine |
| $5.$ | $\text{CH}_3-\text{CH}_2-\text{CH}_2-\text{NH}-\text{CH}_2$ | $N -$ Ethylethanamine |
| $6.$ | $\text{CH}_3-\text{CH}_2-\text{CH}_2-\text{NH}-\text{CH}_3$ | $N -$ Methylpropanamine |
| $7.$ | $ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{CH}-\text{NH}-\text{CH}_3$ | $N -$ Methylpropan $- 2 -$ amine |
| $8.$ | $ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{CH}_2-\text{N}-\text{CH}_3$ | $N, N -$ Dimethylethanamine |
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