The most stable conformation of $n-$butane is

The correct order of relative stability of the given conformers of $n$-butane is

Which of the following conformations will be the most stable?

Select the correct option about conformations of ethane.

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

The Newman projection formula of the most stable conformation of $3$-hydroxypropanal is gauche. It is stable due to