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# The hydrocarbon which can react with sodium in liquid ammonia is

$\begin{array}{1 1}(a)\;CH_3CH_2C\equiv CCH_2CH_3\\(b)\;CH_3CH_2CH_2C\equiv CCH_2CH_2CH_3\\(c)\;CH_3CH_2C\equiv CH\\(d)\;CH_3CH=CHCH_3\end{array}$

Hence (c) $CH_3CH_2C\equiv CH$ is the correct option.