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  4. On reaction with sodium, which of the following compounds liberate hydrogen gas?

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Q. On reaction with sodium, which of the following compounds liberate hydrogen gas?

NTA AbhyasNTA Abhyas 2020

Solution:

Only acetylene has acidic hydrogens and hence reacts with Na to evolve $H_{2}$ gas.
$2 \text{HC} \equiv \text{CH} + 2 \text{Na} \rightarrow 2 \text{HC} \equiv \text{CNa} + \text{H}_{2}$