Which of the following reagents results in anti-addition of hydrogen atoms to the triple bond?

H_{2} / P d - B a S O_{4}

in quinoline

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L i / N H_{3}

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N i_{2} / H_{2}

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R h O_{2}

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Solution

The correct option is A $L i / N H_{3}$
Alkene can be produced from alkyne by controlled partial hydrogenation reduction.
This can be done by any of the following methods:
1. Reduction of alkyne in the presence of Lindlar's catalyst. It forms cis alkene.
2. Birch reduction: reduction of alkyne with Na/Li in liq. ammonia. It forms trans alkene.

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Similar questions

H_{2}

P d / B a S O_{4}

CH3COCl+H2------->CH3CH2OH------->CH3CHO(in presence of pd,BaSO4 and quinoline).

Here quinoline acts as what?

a)+ve catalyst

b)catalyst poison

c)promoter

d)medium

H_{2}

P d / C a C O_{3}

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