The isomers that can be interconverted due to rotation around a carbon-carbon bond are called ............ .

The lowest energy conformer of $n$-butane is

Which of the following molecules exhibit conformational isomerism?

The correct statement regarding ethane conformation is:

Least energetic conformation of cyclohexane is

Statement $I$: Staggered conformation of ethane is more stable than the eclipsed conformation.
Statement $II$: The torsional strain in staggered conformation is more than in the eclipsed conformation.