How many gauche conformations are possible for n-butane?

How many isomers are possible for butane?

How many extreme conformations can be drawn for n -butane if we consider rotation about the C_(2) and C_(3) bonds?

How many structural isomers are possible for butane?

The number of conformational isomers possible of n-butane about C_(2)-C_(3) bond

How many chiral compounds are possible on mono-chlorination of - Methyl butane ?

The dihedral angle between the two methyl groups in gauche conformation of n-butane is