In the following the most stable conformation of n- butane is (AIPMT 2010) (a) (b) (c) (d)

Conformation isomers are obtained by the rotation around the single bond. It results in different spatial arrangements of atoms. There are different types of conformational isomers exhibited by the butane. (1) Anti (Staggered) (2) Gauche (3) Eclipsed (4) Fully Eclipsed GENERAL ORGANIC CHEMISTRY 66 Staggered (Anti) are the conformers in which all the atoms are equally spaced from each other and there is minimum steric hinderance between them and thus increases the stability. Thus, the correct option is (c)