Which one of the following conformations of cyclohexane is chiral?

If the $C_2$ carbon in the given Newman projection is rotated by $120^{\circ}$ in the anticlockwise direction,what will be the resulting conformation of the $C_2-C_3$ bond?

Which of the following isomeric structures has the lowest energy?

Different conformations of the same molecule are called

Which statement is true for cyclohexane?

Most stable conformation of $n$-butane is