The correct order of reactivity of the halides,
(I) ethyl chloride; (II) isopropyl chloride and (III) benzyl chloride in $S_{N} 1$ reaction is:

I > I I > I I I

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I I I > I I > I

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I I > I > I I I

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I > I I I > I I

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Solution

The correct option is B $I I I > I I > I$
For $S_{N} 1$ reactions, the greater the stability of carbocations formed, faster will be the rate of reaction. Thus, the order of reactivity of halides is $benzyl chloride > isopropyl chloride > ethyl chloride$ .

(Due to greater stabilisation of benzylic carbocation intermediate by resonance, it shows higher reactivity in $S_{N} 1$ reactions than other aliphatic halides).

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