Question
- Write structures of different isomeric amines corresponding to the molecular formula, C4H11N.
- Write 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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