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Question

Select the option(s) in which rate of SN1 is faster in II than I?



Solution

The correct options are
A


B


C


Better the leaving group, more is the rate of SN1 reaction. Also, the more stable the cation, the higher is the rate of SN1 reaction.

Iodide is a much better leaving group than chloride. Tertiary substrates (from the given) tend to undergo faster SN1 reactions. In the final option, it is an SN1 for a secondary versus primary substrates. Primary substrates hardly ever undergo SN1 without a suitable stabilizing factor (conjugation or a suitable neighbouring atom that stabilizes the carbocation formed etc.)

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