Which of the following is the most reactive alkyl halide for a SN1 reaction?
A
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B
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C
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D
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Solution
The correct option is B Compound which forms most stable carbocation will undergo SN1 reaction fastly. Stability of carbocation∝Number of α−Hydrogen
In compound (a), the formed carbocation is tertiary and it has 8 α−Hydrogen
In compound (b), the formed carbocation is secondary and it has 5 α− Hydrogen
In compound (c), the formed carbocation is primary and it has 1 α−Hydrogen
In compound (d), the formed carbocation is primary and it has zero α− Hydrogen
Thus, compound (a) forms most stable carbocation. Therefore, it is the most reactive alkyl halide toward SN1 reaction.