Question

Identify the correct answer

• A. Three resonance structure can be drawn for ozone
• B. BF₃ has non-zero dipole moment
• C. Dipole moment of NF₃ is greater than that of NH₃
• D. Three canonical forms can be drawn for \(CO^{2-}_3 \)ion

Answer 1

The Correct Option is D

1. $BF_3$ is planar and symmetric, so it has zero dipole moment. 

2. Dipole moment of $NH_3$ is greater than that of $NF_3$ due to opposite polarity. 

3. $CO_3^{2-}$ ion has three equivalent resonance structures: $O=C-O^- \leftrightarrow O-C=O^- \leftrightarrow ^-C(O)O^-$ 

4. Ozone ($O_3$) has only two resonance structures.