Hydrocarbons - Result Question 35
####18. 2-hexyne gives trans-2-hexene on treatment with (2004, 1M)
(a) $Li / NH _3$
(b) $Pd / BaSO _4$
(c) $LiAlH _4$
(d) $Pt / H _2$
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Answer:
Correct Answer: 18. (c)
Solution:
- Alkynes on treatment with alkali metals in liquid ammonia gives trans hydrogenation product:
$$ \begin{aligned} CH _3-C \equiv C-CH _2-CH _2-CH _3 \xrightarrow{Li / NH _3} \ H _3 C \backslash C=C \underset{\underset{\text { Hexne }}{CH _2 CH _2 CH _3}}{-H} \end{aligned} $$
