(a) 2-hexyne gives $trans$-2-hexene on treatment $Li/NH_{3}$ $CH_{3} - CH_{2} - CH_{2} - C \equiv C - CH_{3} + H_{2}\overset{Li/NH_{3}\ \ \ }{\rightarrow}$ H | $CH_{3} - CH_{2} - CH_{2} - C = C - CH_{3}$ | H $trans$-2-hexene
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