Which carbocation is the most stable?

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(A) The stability of a carbocation $(C^{\oplus})$ is directly proportional to the extent of conjugation with adjacent $\pi$-bonds.In option $A$,the po

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(A) The stability of a carbocation $(C^{\oplus})$ is directly proportional to the extent of conjugation with adjacent $\pi$-bonds.In option $A$,the positive charge is conjugated with two $\pi$-bonds (a dienyl system),which provides maximum resonance stabilization.In option $B$,the positive charge is on a carbon atom that is part of a double bond (vinylic carbocation),which is highly unstable.In option $C$,the positive charge is conjugated with only one $\pi$-bond.In option $D$,the positive charge is not conjugated with any $\pi$-bond.Therefore,the carbocation in option $A$ is the most stable.

List-$I$ (Pair of Compounds)	List-$II$ (Isomerism)
$A$. $n$-propanol and Isopropanol	$(I)$ Metamerism
$B$. Methoxypropane and ethoxyethane	$(II)$ Chain Isomerism
$C$. Propanone and propanal	$(III)$ Position Isomerism
$D$. Neopentane and Isopentane	$(IV)$ Functional Isomerism

List-$I$ (Pair of Compounds)	List-$II$ (Type of Isomers)
$A$. $2-$Methylpropene and but$-1-$ene	$I$. Stereoisomers
$B$. $Cis-$but$-2-$ene and $trans-$but$-2-$ene	$II$. Position isomers
$C$. $2-$Butanol and diethyl ether	$III$. Chain isomers
$D$. But$-1-$ene and but$-2-$ene	$IV$. Functional group isomers

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