Which of the following compound will evolve $H_{2}$ gas when reacts with alkali metals?

H_{2} C = C H_{2}

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R - O - R

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R - C H_{3}

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R - O H

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Solution

The correct option is D $R - O H$
Alcohols when reacting with sodium metal evolution of hydrogen gas takes place. For example ethyl alcohol (ethanol) when reacting with sodium metal, the formation of sodium ethoxide and hydrogen gas takes place. It can be shown by the following reaction.
$2 R - O H a l c o h o l + 2 N a ⟶ 2 R - O^{-} N a^{+} s o d i u m a l k o x i d e + H_{2 (g)} ↑$

$2 R - O H E t h a n o l + 2 N a ⟶ 2 R - O^{-} N a^{+} s o d i u m e t h o x i d e + H_{2 (g)} ↑$

Hence, option $D$ is correct.

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