Single Choice

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

A$$CH_3CH_2C\, \equiv\, CH$$
Correct Answer
B$$CH_3CH = CHCH_3$$
C$$CH_3CH_2C\, \equiv\,CCH_2CH_3$$
D$$CH_3CH_2CH_2C\, \equiv\,CCH_2CH_2CH_3$$

Solution

$$\bf{Hint:}$$ Only terminal alkynes react with $$Na$$ in liquid $$NH_{3}$$.

$$\bf{Explanation:}$$

Alkynes in which the unsaturated bond present at one end of the parent chain can easily reacts with $$Na$$ in liquid ammonia because these terminal alkynes have an $$H^{+}$$ acidic protons that readily react with the sodium–liquid ammonia mixture to form sodium acetylide. As shown below:


As other given alkynes are not terminal alkynes , therefore, do not react with $$Na$$ in liquid $$NH_{3}$$.
Also alkenes do not give reaction with $$NaNH_2$$.

$$\bf{Final \ answer:}$$ Option $$A$$

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