Which is most polar?

(A)CH₂Cl₂

(B)CHCl₃

(C)CCl₄

polar is nothing but having a pair of equal & opposite charges

how to determined if the molecule is polar or non polar in the question ?

if the electro negativities of the two atoms has a difference of 0.3 or less then the bond is non polar

if the electronegativities of the two atoms has a difference of greater than 0.3 or less than 0.7 then the bond is polar

if the two values have a greater than 1.7 than the bond is ionic which is very very polar

 apply above concept to the question out of three option CHCl3 is more polar