Name a group of organic compounds that can be hydrogenated. With the help of a suitable example explain the process of hydrogenation along with the conditions that are required for it. Name any natural organic compound that is hydrogenated.

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Solution

Alkenes can be hydrogenated.
The addition of hydrogen to an unsaturated hydrocarbon to obtain a saturated hydrocarbon is called hydrogenation.
Example: Ethene reacts with hydrogen in the presence of finely divided nickel as a catalyst to form ethane.
Liquid vegetable oils are hydrogenated into vegetable ghee (solid fat).
$C H_{2} = C H_{2} + H_{2} N i C a t a l y s t - ------ \to H e a t C H_{3} - C H_{3}$ .

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