Assertion :If the hydrogen atoms of benzene are replaced by deuterium atoms then the reactivity of benzene ring is decreased for ESR. Reason: The bond strength of C-D is more than C-H, so reaction depends on the bond strength of C-D and C-H.

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
Because when Hydrogen is replaced by deuterium ion the speed of the reaction decreases as the $C - D$ bond is stronger than $C - H$ bond and the reaction depends upon the bond strength of $C - D$ & $C - H$ bond.

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