The molecules CCl₄, CHCl₃, and CH₂Cl₂ all have tetrahedral arrangements around the central carbon atom. Rank them from smallest to largest net dipole moment.
a) CCl4<CH2Cl2<CHCl3
b) CCl4<CHCl3<CH2Cl2
c) CH2Cl2<CHCl3<CCl4
d) CH2Cl2<CCl4<CHCl3