Which of the following is the correct stability order for given carbocations?

5>4>2>1>3

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3>4>2>1>5

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3>5>2>1>4

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1>3>5>4>2

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Solution

The correct option is A 5>4>2>1>3
Stability of a carbocation is increased by the presence of conjugation of a double bond with it. Also, the tertiary carbocation is more stable than secondary, which is then followed by primary carbocation.
From these conclusions, the order of stability will be:
$5 (conjugation+tertiary) > 4 (conjugation+secondary) > 2 (tertiary) > 1 (secondary) > 3 (primary)$

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