Most stable carbocation among the following i | vedclass

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(A) The stability of a carbocation is significantly increased by the presence of an adjacent heteroatom with lone pairs,such as oxygen,due to resonanc

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(A) The stability of a carbocation is significantly increased by the presence of an adjacent heteroatom with lone pairs,such as oxygen,due to resonance stabilization (back-bonding).In option $A$,the positive charge is on the carbon atom directly attached to the oxygen atom. The lone pair on the oxygen can delocalize into the empty $p$-orbital of the carbocation,forming a stable oxonium ion structure $(C=O^+)$.In other options,the positive charge is further away from the oxygen atom,meaning the resonance stabilization effect is either absent or significantly weaker.Therefore,the carbocation in option $A$ is the most stable.

Most stable carbocation among the following is:

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