Identify the correct order of stability of th | vedclass

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(C) To determine the stability of carbocations,we consider factors like resonance,aromaticity,and hyperconjugation.$1$. The $1$-methylcyclopenta-$2,4$

Vedclass · Accepted Answer

$1-$methylcyclopenta$-2,4-$dien$-1-$yl cation

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(C) To determine the stability of carbocations,we consider factors like resonance,aromaticity,and hyperconjugation.$1$. The $1$-methylcyclopenta-$2,4$-dien-$1$-yl cation $(c)$ is aromatic because it has a planar cyclic structure with $6 \pi$ electrons ($4n+2$ rule,where $n=1$),making it exceptionally stable.$2$. The cyclopropylmethyl carbocation $(a)$ is stabilized by the phenomenon of 'bent bonds' or $\sigma$-conjugation,where the electrons of the cyclopropane ring overlap with the empty $p$-orbital of the carbocation.$3$. The $1$-methylcyclohex-$2$-en-$1$-yl cation $(b)$ is stabilized by resonance with the adjacent double bond.$4$. The $1$-methylcyclohexyl cation $(d)$ is a tertiary carbocation stabilized only by hyperconjugation and inductive effects.Comparing these,the aromatic cation $(c)$ is the most stable. The cyclopropylmethyl cation $(a)$ is highly stable due to $\sigma$-conjugation. The allylic cation $(b)$ is more stable than the simple tertiary alkyl cation $(d)$.Therefore,the correct order of stability is $c > a > b > d$.

Identify the correct order of stability of the following carbocations:

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