Which among the following halides will generate the most stable carbocation in the nucleophilic substitution reaction?
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Answer
(2) [figure]
Solution
SN1 rate stability of the carbocation (resonance).
[figure]
Ph3C : charge delocalised over 3 rings (9 o/p positions) – more than benzyl (3), allyl (2), cyclohexenyl (2).
Answer: (2)