The vapour density of unsturated acyclic aliphatic compound $X$ is $35$ . Mention the chain isomers of alcohol with same number of carbon atoms as in $X$ .

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Solution

The molecular mass of unsaturated acyclic aliphatic compound $= 2 \times$ Vapour density $= 2 \times 35 = 70$
If $X$ is alkene: ( $C_{n} H_{2 n}$ )
Molecular massof $X = 70$
$\Rightarrow$ $(n \times 12) + (2 n \times 1) = 70$
$\Rightarrow$ $14 n = 70$ $\to$ $n = 5$
Alcohol with $5$ carbon atoms is $C_{5} H_{12} O$ . The chain isomers if $C_{5} H_{12} O$ are given.
(1) $C H_{3} C H_{2} C H_{2} C H_{2} C H_{2} O H = n - p e n t a n o l (p e n t a n e - 1 - o l)$
(2) $C H_{3} C H_{2} C H_{2} C H (O H) C H_{3} = 2 - p e n t a n o l (p e n t a n e - 2 - o l)$
(3) $C H_{3} C H_{2} C H (O H) C H_{2} C H_{3} = 3 - p e n t a n o l (p e n t a n e - 3 - o l)$
(4) $C H_{3} C H_{2} C H (C H_{3}) C H_{2} O H = 2 - m e t h y l - 1 - b u t a n o l$
(5) $C H_{3} C H_{2} C (C H_{3}) (O H) C H_{3} = 2 - m e t h y l - 2 - b u t a n o l$
(6) $C H_{3} C H (O H) C H (C H_{3}) C H_{3} = 3 - m e t h y l - 2 - b u t a n o l$
(7) $C H_{2} (O H) C H_{2} C H (C H_{3}) C H_{3} = 4 - m e t h y l - 1 - b u t a n o l$
(8) $C H_{3} C H (C H_{3}) C H_{2} C H_{2} O H = 3 - m e t h y l - 1 - b u t a n o l$
(9) $C H_{3} C {(C H_{3})}_{2} C H_{2} O H = 2, 2 - d i m e t h y l - 1 - p r o p a n o l$

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