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Question

Which of the following carbocation is the least stable?

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 A
According to Bredt's Rule:
The possibility of formation of multiple bonds, intermediates (cation and radical), transition states at the bridge head position is negligible because it creates a strain at the already strained position.
In option (a), the carbocation is at bridge head position making it the least stable.

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