Hydrocarbons 2 Question 18
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18. 2-hexyne gives trans-2-hexene on treatment with (2004, 1M)
======= ####18. 2-hexyne gives trans-2-hexene on treatment with (2004, 1M)
3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed (a) $\mathrm{Li} / \mathrm{NH}_{3}$
(b) $\mathrm{Pd} / \mathrm{BaSO}_{4}$
(c) $\mathrm{LiAlH}_{4}$
(d) $\mathrm{Pt} / \mathrm{H}_{2}$
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Answer:
Correct Answer: 18. (c)
Solution:
- Alkynes on treatment with alkali metals in liquid ammonia gives trans hydrogenation product:
$$ \begin{aligned} \mathrm{CH}{3}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}{2}-\mathrm{CH}{2}-\mathrm{CH}{3} \xrightarrow{\mathrm{Li} / \mathrm{NH}{3}} \ \mathrm{H}{3} \mathrm{C} \backslash \mathrm{C}=\mathrm{C} \underset{\underset{\text { Hexne }}{\mathrm{CH}{2} \mathrm{CH}{2} \mathrm{CH}_{3}}}{-\mathrm{H}} \end{aligned} $$
