When 2-butyne is treated with in presence of Pd-; the product formed will be

Question

When 2-butyne is treated with $H_2$ in presence of Pd-$BaSO_4$; the product formed will be

Prashant Kotian · Accepted Answer

Correct answer: A. But-2-yne on reduction with Lindlar’s catalyst gives cis alkenes as the predominant product. The attack of hydrogen on triple bond will take place in syn fashion. To minimize the effect of further reduction to alkane, palladium metal is poisoned with barium suphate. The reaction equation and mechanism is as follows:

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