Choose the correct order of stability for the following carbocations.

(a) > (b) > (c)

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(c) > (b) > (a)

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(b) > (c) > (a)

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(a) > (c) > (b)

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Solution

The correct option is B $(c) > (b) > (a)$
For compound (a), carbocation is at bridge head position, it is the least stable because presence of carbocation creates a strain at the already strained position.

For structure (c), there are 8 $α$ -hydrogens, whereas in structure (b) there are 3 $α$ -hydrogens.

So, structure (c) will have more hyperconjugative structures and more will be the stability.
The correct order for the stability is: $(c) > (b) > (a)$

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