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Question

BLindlars catalyst/H2−−−−−−−−−−−−RCCRNa/Liq.NH3−−−−−−−A.

A and B are geometrical isomers of RC CR

A
A is cis, B is trans
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B
A is trans, B is cis
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C
A and B both are cis
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D
A and B both are trans
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Solution

The correct option is C A is trans, B is cis
Alkyne reacts with hydrogen in presence of Na/liq. ammonia, this is anti addition so here trans alkene form as product.
Alkyne reacts with hydrogen in presence of Lindlar's catalyst, this is syn addition so here cis alkene form as product.
124735_26409_ans_5a73e6acc3ba48c0b6584fa633ee2da5.png

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