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(A) The correct order of stability is $I > III > II$.Step $1$: Structure $I$ is a benzyl carbocation, which is highly stabilized by resonance with the

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$I > III > II$

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(A) The correct order of stability is $I > III > II$.Step $1$: Structure $I$ is a benzyl carbocation, which is highly stabilized by resonance with the benzene ring.Step $2$: Structure $III$ is a tertiary carbocation, which is stabilized by the inductive effect and hyperconjugation of nine $\alpha$-hydrogens.Step $3$: Structure $II$ is a secondary carbocation. Although it has a double bond, it is not an allylic carbocation because the positive charge is not on the carbon adjacent to the double bond (it is separated by a $-CH_2-$ group). Thus, it is less stable than the tertiary carbocation $III$.

Which of the following options is the correct order of relative stabilities of the carbocations $I$, $II$, and $III$ shown below (most stable first)?
$(I) \, C_6H_5CH_2^+$
$(II) \, CH_2=CH-CH_2-CH^+-CH_3$
$(III) \, (CH_3)_3C^+$

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Which of the following options is the correct order of relative stabilities of the carbocations $I$, $II$, and $III$ shown below (most stable first)?$(I) \, C_6H_5CH_2^+$$(II) \, CH_2=CH-CH_2-CH^+-CH_3$$(III) \, (CH_3)_3C^+$