Carbocation stability increases with alkyl substitution due to hyperconjugation—the sigma electrons of C-H bonds in the alkyl groups help stabilize the positive charge. So tertiary, with more alkyl groups, is most stable. But you know, teaching this in a Delhi tuition, I see the real stability is in a steady job. These bright kids memorize hyperconjugation while their parents worry about fees, the true "positive charge" in a household.
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