Unsaturated hydrocarbons undergo _____ reaction with hydrogen in the presence of palladium or nickel catalyst.

hydration

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substitution

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addition

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dehydration

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Solution

The correct option is C addition
Unsaturated hydrocarbons undergo addition reaction with hydrogen in the presence of palladium or nickel catalyst.
The hydrogen atoms get attached to the double or triple bond and form saturated hydrocarbons.

For example,
${CH}_{2} = {CH}_{2} (g) + H_{2} (g) Ni / Pd - -- \to {CH}_{3} - {CH}_{3} (g) Ethene Ethane$

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