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Question
Which of the following is the most reactive alkyl halide for a SN1 reaction?
Which of the following is the most reactive alkyl halide for a SN1 reaction?
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Solution
The correct option is A
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.
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.
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