Question
- Write structures of different isomeric amines corresponding to the molecular formula, $C_4H_{11}N.$
- 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 - $Dimethylethanamine |
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Match the starting materials given in Column I with the products formed by these (Column II) in the reaction with II.
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Column I
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Column II
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(i)
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$CH_3-o-CH_3$
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(a)
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(ii)
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(b)
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$\ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3 \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ | \\ \text{CH}_3-\text{C}-\text{I}+\text{CH}_3\text{OH} \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ | \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
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(iii)
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$\ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3 \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ | \\ \text{H}_3\text{C}-\text{C}-\text{O}-\text{CH}_3 \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ | \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
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(c)
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(iv)
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(d)
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$CH_3-OH + CH_3-I$
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(e)
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(f)
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(g)
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$\ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3 \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ | \\ \text{CH}_3-\text{C}-\text{OH}+\text{CH}_3\text{I} \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ | \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
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Arrange the following in order of property indicated for set.
$CH_3CHO, CH_3CH_2OH, CH_3OCH_3, CH_3CH_2CH_3 $(increasing order of boiling points$).$
→$CH_3CHO, CH_3CH_2OH, CH_3OCH_3, CH_3CH_2CH_3 $(increasing order of boiling points$).$