Relative stabilities of the following carbocation will be in order:

I V < I I I < I I < I

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I V < I I < I I I < I

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I I < I V < I I I < I

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I < I I < I I I < I V

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Solution

The correct option is B $I V < I I < I I I < I$
Benzyl carbocation is more stable then alkyl $(C H_{3} \oplus C H_{2}) . C H_{3} O -$ and $C H_{3} -$ , both stabilise benzyl carbocation and among them $C H_{3} O -$ shows +M effect hence is more stable than $C H_{3} -$ . Thus, correct order of stabilities will be
$I V < I I < I I I < I$

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