Assertion : Rate of ethanolysis of $1^{o}$ halide by $S_{N} 1$ mechanism is fast.
Reason : Carbocation is stabilised by resonance.

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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Assertion is incorrect but Reason is correct

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
The ethanolysis of primary alkyl halide generally proceeds
via $S_{N} 2$ mechanism. In case it proceeds via $S_{N} 1$ mechanism, the intermediate
carbocation is unstable, since it has no adjacent carbon atom for resonance.
Hence, both assertion and reason are incorrect.

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ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

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(a) Both assertion and reason are correct and the reason is correct explanation of assertion
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(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Assertion : Rate of ethanolysis of 1o halide by SN1 mechanism is fast.Reason : Carbocation is stabilised by resonance.

Assertion : Rate of ethanolysis of $1^{o}$ halide by $S_{N} 1$ mechanism is fast.
Reason : Carbocation is stabilised by resonance.