What happen when but-2-yne reacts with Lindlar's catalyst?

Formation of n-butane takes place

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Formation of cis-but-2-ene takes place

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Formation of trans-but-2-ene takes place

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Alkynes doesnot react with lindlar's catalyst

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Solution

The correct option is B Formation of cis-but-2-ene takes place
In presence of lindlar's catalyst $(H_{2}, P d / B a S O_{4})$ , alkynes undergo partial reduction. the addition of the hydrogen substituent always proceeds via syn addition (addition of the substituent on the same side of the bond). Therefore, the final product is purely cis-isomer of the alkene i.e cis-but-2-ene.

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When But-2-yne reacts with HBr ,it gives:

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