Question

Which of the following molecules does not exhibit dipole moment?

• A. CC14
• B. CO2
• C. NH3
• D. CHC13
• E. H2O
• F. CH3 - O- CH3
• G. (ii), (v), (iv)
• H. (i), (iii), (vi)
• I. (i), (ii)
• J. O (iii), (iv), (vi)

Answer 1

Answer: (I)

(i), (ii)

Answer 2

For a molecule to be nonpolar, its geometry must be symmetric so that individual bond dipoles cancel out.

1. CCl₄: Tetrahedral symmetry; all C–Cl bond dipoles cancel, resulting in no net dipole moment.
2. CO₂: Linear geometry with two identical C=O bonds in opposite directions; dipoles cancel.

The other molecules have asymmetry leading to net dipole moments.