E-1,2-dichlorocyclopropane has no plane of symmetry. Mirror image of E-1,2-dichlorocyclopropane is not superimposable on it. It is chiral and optically active.
Bromochlorofluoromethane has no plane of symmetry. Mirror image of Bromochlorofluoromethane is not superimposable on it. It is chiral and optically active.