a
\(\mathrm{H}-\mathrm{C}=\mathrm{C}-\mathrm{C}_{2} \mathrm{H}_{5} \stackrel{\mathrm{NaNH}_{2}}{\longrightarrow} \mathrm{Na}^{+} \ddot C^- \equiv \mathrm{C}-\mathrm{C}_{2} \mathrm{H}_{5}+\mathrm{NH}_{3}\)
It has one acidic hydrogen
\(\mathrm{CH}_{3}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_{3} \stackrel{\mathrm{NaNH}_{2}}{\longrightarrow}\) No acidic hydrogen