Which carbocation is the least stable?

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(A) The stability of carbocations is determined by factors such as inductive effect,hyperconjugation,and resonance. $1$. $(CH_3)_3C^+$ is a tertiary c

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$H_3C^+$

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(A) The stability of carbocations is determined by factors such as inductive effect,hyperconjugation,and resonance. $1$. $(CH_3)_3C^+$ is a tertiary carbocation,which is highly stable due to the $+I$ effect of three methyl groups and hyperconjugation. $2$. $(CH_3)_2CH^+$ is a secondary carbocation,which is moderately stable. $3$. $CH_2=CH-CH_2^+$ is an allyl carbocation,which is stabilized by resonance. $4$. $H_3C^+$ is a methyl carbocation,which has no alkyl groups to provide electron density through $+I$ effect or hyperconjugation. Therefore,$H_3C^+$ is the least stable carbocation.

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