Assertion :Primary benzylic halides are more reactive than primary alkyl halides towards $S_{N} 1$ reaction.
Reason: Reactivity depends upon the nature of the nucleophile and the solvent.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Primary benzylic halides are more reactive than primary alkyl halides towards $S_{N} 1$ reaction as the carbocation formed is resonance stabilized. (benzylic carbocation is more stable than primary carbocation)
Also, the reactivity depends upon the nature of the nucleophile and the solvent.
Therefore option $B$ is correct.

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Assertion :Primary benzylic halides are more reactive than primary alkyl halides towards SN1 reaction. Reason: Reactivity depends upon the nature of the nucleophile and the solvent.

Assertion :Primary benzylic halides are more reactive than primary alkyl halides towards $S_{N} 1$ reaction.
Reason: Reactivity depends upon the nature of the nucleophile and the solvent.