Oils on treating with hydrogen in presence of palladium or nickel catalyst form fats. This is an example of:

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Addition reaction

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Oxidation reaction

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Detailed Solution

Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of an addition reaction.
Treating oils with hydrogen in the presence of a catalyst such as palladium or nickel is an example of an addition reaction.
In this reaction, hydrogen is added to oils. Palladium or nickel catalysts are used to speed up the reaction rate.
This reaction leads to the conversion of double bonds present in oils to a single bond or, in other words, an unsaturated molecule to a saturated molecule.
An addition reaction is a chemical reaction in which two or more reactants come together to form a larger single product.
$C H_{3} C H = C H_{2} + H C l \overset{}{\to} C H_{3} C H C l C H_{3}$