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Question

BLindral/H2−−−−−−RCCRNa/NH3−−−− A and B are geometrical isomers (R - CH = CH - R):


A

A and B both are trans

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B

A is cis, B is trans

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C

A is trans, B is cis

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D

A and B both are cis

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Solution

The correct option is C

A is trans, B is cis


Controlled hydrogenation of alkyne with lindlar catalyst follows syn addition giving rise to cis alkene; and with Na/NH3 follows anti addition giving rise to trans alkene.


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