Question: is chcl3 has zero dipole moment?
Answer: the dipole moment of CHCl3 is less than that of CH2Cl2 because the bond dipole of third C-Cl bond opposes the resultant of bond dipoles of the other 2 C-Cl bonds. The dipole moments follow the sequence CH2Cl2 > CHCl3 > CCl4 ( 1,58 > 1,02 > 0).