Sketch the bond moments and resultant dipole moment in SO2, cis and trans forms of CH₂Cl₂.

SO₂: SO₂ molecule has a bent shape in which two S = O bonds are oriented at an angle of 119-5°. The bond dipoles and the resultant dipole moment in the SO₂ molecule are represented as shown.
Cis form of CH₂Cl₂ has two chlorine atoms on the same side has a small resultant dipole moment while trans– form of CH₂Cl₂ has two chlorine atoms on the opposite side, the bond dipoles of the two C – Cl bonds cancel each other.

Therefore the resultant dipole moment of trans form is zero.