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  4. What is the product when 2 -butyne is treated with liquid NH3 in presence of lithium ?

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Q. What is the product when $ 2 $ -butyne is treated with liquid $ NH_3 $ in presence of lithium ?

AMUAMU 2019

Solution:

$\underset{\text{2-butyne}}{{CH_{3} — C}} \equiv CH+2[H] \xrightarrow[{liq. NH_{3}}]{Li}$
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But, in presence of Lindlar’s catalyst
$(Pd-CaCO_{3})$ $2$-butyne reacts with hydrogen giving cis-2-butene
$\underset{\text{2-butyne}}{{CH_{3}—C}}CH+H_{2} \xrightarrow{pd. CaCO_{3}}$
image