Ans- option a, c and f have Asymmetric Carbon
Explanation-
An asymmetric Carbon, also called a Chiral carbon is that carbon atom which is bonded to 4 different gropus Or we can say to this C-atom no two same gropus are bonded. The compound in which at least 1 asymmetric carbon is present is called a Chiral molecule.
Now in the given options-


So, I though a,b, c, & e! or did I missed another one? U 13-dibromo cyclobutane...