Which of the following is relatable to Hydrogenation reaction?

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Alkenes to alkanes in presence of Nickel

Alkanes to alkenes in presence of Nickel

Addition of an oxygen in alkene

Alkenes to alkanes in presence of Chromium

answer is A.

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Detailed Solution

Addition of hydrogen to alkenes is the hydrogenation reaction.
When hydrogen is added to unsaturated hydrocarbons having double or triple bonds (alkenes or alkynes) in the presence of nickel as a catalyst, the reaction is called a hydrogenation reaction.

Example: ${CH}_{2} = {CH}_{2} + H_{2} \overset{N i}{\to} C H_{3} - {CH}_{3}$

In the given reaction, hydrogen is added to ethene (alkene) in the presence of nickel as catalyst ethane releases. This reaction is a hydrogenation reaction because hydrogen is added.

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