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(A) In $cis-1$-ethyl-$3$-methylcyclohexane $(A)$,the substituents at positions $1$ and $3$ are on the same side of the ring. In the chair conformation

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$A$ is more stable

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(A) In $cis-1$-ethyl-$3$-methylcyclohexane $(A)$,the substituents at positions $1$ and $3$ are on the same side of the ring. In the chair conformation,this allows both the ethyl group and the methyl group to occupy equatorial positions simultaneously,minimizing steric repulsion.In $trans-1$-ethyl-$3$-methylcyclohexane $(B)$,the substituents at positions $1$ and $3$ are on opposite sides of the ring. In the chair conformation,one substituent must be equatorial while the other must be axial.Since having both substituents in equatorial positions is more stable than having one axial and one equatorial,$compound \, A$ is more stable than $compound \, B$.

Compare the stabilities of the following two compounds $(A)$ and $(B)$:
$A$ : $cis-1$-ethyl-$3$-methylcyclohexane
$B$ : $trans-1$-ethyl-$3$-methylcyclohexane

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Compare the stabilities of the following two compounds $(A)$ and $(B)$:$A$ : $cis-1$-ethyl-$3$-methylcyclohexane$B$ : $trans-1$-ethyl-$3$-methylcyclohexane