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Hydroboration Oxidation

Identify the ...

Question

Identify the correct sequence of given steps for the conversion of calcium carbide to methyl alcohol.
(a) Reaction with aqueous KOH
(b) Hydrolysis
(c) Reaction with soda lime
(d) Reaction with $H g S O_{4} / H_{2} S O_{4}$
(e) Potassium dichromate, $K_{2} C r_{2} O_{7}$
(f) Reaction with $P C l_{5}$

A

b d e c f a

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B

b d c a f e

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C

b f d e a c

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D

d b c e f a

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Solution

The correct option is A b d e c f a
The steps involved can be written as:
i) Hydrolysis of calcium carbide to give acetylene as:
$C a C_{2} + 2 H_{2} O \to C_{2} H_{2} + C a (O H)_{2}$
ii) Hydration of acetylene in the presence of $H g S O_{4} a n d H_{2} S O_{4}$ as:
$H C \equiv C H H g^{2 +}, H^{+} - ----- \to C H_{3} C H O$
iii) Acetaldehyde is converted to methyl alcohol as:
$C H_{3} C H O K_{2} C r_{2} O_{7} - ---- \to C H_{3} C O O H N a O H - --- \to C H_{3} C O O N a P C l_{5} - -- \to C H_{3} C l K O H - -- \to C H_{3} O H$

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