Olefins can be hydrogenated by

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(C) Olefins (alkenes) undergo catalytic hydrogenation in the presence of metal catalysts like $Ni$,$Pd$,or $Pt$ and hydrogen gas $(H_2)$.Raney $Ni$ is

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Raney $Ni$ and $H_2$

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(C) Olefins (alkenes) undergo catalytic hydrogenation in the presence of metal catalysts like $Ni$,$Pd$,or $Pt$ and hydrogen gas $(H_2)$.Raney $Ni$ is a highly active form of nickel catalyst commonly used for the hydrogenation of alkenes to alkanes.The reaction is represented as:$-C=C- + H_2 \xrightarrow{	ext{Raney } Ni} -CH-CH-$ (hydrogenation)Therefore,the correct option is $(C)$.

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