Chemical BondingMedium
Question
Identify the correct answer.
Options
A.Dipole moment of ${NF}_{3}$ is greater than that of ${NH}_{3}$
B.Three canonical forms can be drawn for ${CO}_{3}^{2 -}$ ion
C.Three resonance structures can be drawn for ozone
D.${BF}_{3}$ has non-zero dipole moment
Solution
Sol. [Key Concept: Dipole moments and resonance structures]
Carbonate, CO₃²⁻, has three equivalent principal canonical forms, differing in which C–O bond is drawn as double. Therefore option (2) is correct. NF₃ has a smaller dipole moment than NH₃ because its bond dipoles oppose the lone pair contribution. Ozone has two principal octet resonance forms. BF₃ is trigonal planar and its bond dipoles cancel, giving zero net dipole moment.
NF₃ and NH₃ 
Carbonate resonance forms 
BF₃ 
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