Assertion :Heat of hydrogenation of $C H_{2} = C H_{2}$ is greater than $C H_{3} C H = C H_{2}$ . Reason: $C H_{3}$ give additional effect to double bond

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Lower energy molecules are more stable than higher energy molecules. More substituted alkenes are more stable than less substituted ones due to hyperconjugation. They have a lower heat of hydrogenation.

Here the methyl group stabilises the double bond by hyperconjugation leading to a higher heat of hydrogenation.

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