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(A) Let us analyze the stability of each pair:$(A)$ The first ion is a carbocation stabilized by the $+M$ effect of the $-OMe$ group (back bonding),wh

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$A$ & $B$ only

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(A) Let us analyze the stability of each pair:$(A)$ The first ion is a carbocation stabilized by the $+M$ effect of the $-OMe$ group (back bonding),whereas the second is stabilized only by the $+I$ effect of the $-Me$ group. Thus,the first is more stable.$(B)$ The first ion is a carbanion stabilized by the $-M$ and $-I$ effects of the $-NO_2$ group,whereas the second is a carbocation destabilized by the $-I$ effect of the $-NO_2$ group. Thus,the first is more stable.$(C)$ The first ion is a primary carbocation,while the second is an allylic carbocation stabilized by resonance. Thus,the second is more stable.$(D)$ The first ion is a tertiary carbocation,while the second is a carbocation stabilized by the $+M$ effect of the $-OMe$ group. Thus,the second is more stable.Therefore,the pairs where the first ion is more stable than the second are $(A)$ and $(B)$.

In which pairs,the first ion is more stable than the second?

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