Identify the correct answer.

• A

  $\mathrm{BF}_3$ has non-zero dipole moment
• B

  Dipole moment of $\mathrm{NF}_3$ is greater than that of $\mathrm{NH}_3$
• Correct answer
  C

  Three canonical forms can be drawn for $\mathrm{CO}_3^{2-}$ ion
• D

  Three resonance structures can be drawn for ozone

Solution

(1)
(2)
(3)
(4) In ozone; there are two resonating structures.

Hence, the correct answer is option: 'C'.