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Topic: Electronegativity, Fajan's rule, dipole moment· Chemical Bonding and Molecular Structure

Which of the following set of molecules will have zero dipole moment ?

1. Ammonia, beryllium difluoride, water, 1,4-dichlorobenzene

2. Boron trifluoride, hydrogen fluoride, carbon dioxide, 1,3-dichlorobenzene

3. Nitrogen trifluoride, beryllium difluoride, water, 1,3-dichlorobenzene

4. Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene

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Best answer

Answer: 4. Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene

Zero dipole moment needs a symmetric shape where bond dipoles cancel.

  • \(\mathrm{BF_3}\) (trigonal planar), \(\mathrm{BeF_2}\) (linear), \(\mathrm{CO_2}\) (linear) and 1,4-dichlorobenzene (para, symmetric) all have zero net dipole.
  • Ammonia, water, HF, \(\mathrm{NF_3}\) and 1,3-dichlorobenzene are polar.

Only option (4) has all four non-polar.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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