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