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Question
In the following pair of halogen compounds, which compound undergoes a faster SN1 reaction?
Solution
The activity of halogen compounds in SN1 reaction depends on the stability of the carbocation formed due to ionization. The order of stability is tertiary > secondary > primary. Hence, 3° alkyl chloride is more active than 2° alkyl chloride. Hence, 2° alkyl chloride is more active in SN1 reaction.
will react faster. The carbocation 
will be more stable and hence the reaction will be faster.
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