Select the correct statements:
A. Eclipsed and staggered ethanes given differet produces on reaction with chlorine in presence of light.
B. The ocnformational isomers can be isolated at room temperature
C. Torsional strain in ethane is minimum at dihedral angel `60^(@), 180^(@) and 300^(@)`
D. Steric strain in minumum in staggered gauche form of n-butane
