Which one of the following carbocation is the most stable?

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Solution

The correct option is C
$- C H_{3}$ group when present at ortho or para position stabilises the benzylic cation through hyperconjugation. At meta postion it operates +I effect only.
$N O_{2}$ group shows strong electron withdrawing effect and hence it destabilises the carbocation.
So the stability will order be:
$c > d > a > b$

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