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  4. Alkynes can be reduced to alkenes by hydrogenation in presence of

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Q. Alkynes can be reduced to alkenes by hydrogenation in presence of

Hydrocarbons

Solution:

$CH \equiv CH \xrightarrow[\text{Catalyst}]{\text{Lindlar}} CH_2 = CH_2$.
Lindlar catalyst prevents further reduction of ethene to ethane