Increasing rate of $S_{N} 1$ reaction for the following compounds is:

I < II < III < IV

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II < I < III < IV

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I < II < IV < III

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II < I < IV < III

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Solution

The correct option is B II < I < III < IV
More stable carbocation intermediates, higher will be the rate for $S_{N} 1$ reaction.
The electronic effects by the substituents on the carbocation formed are as follow:

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