NEET 2020 · ChemistryDipole momentPrevious Year Question

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

Answer: (B) Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene. \textbf{Answer:} (B) Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene \textbf{Solution:} $BF X_{3}$ (trigonal planar), $BeF X_{2}$ (linear), $CO X_{2}$ (linear) and 1,4-(para)-dichlorobenzene are all symmetric, so their bond dipoles cancel to give net $μ = 0$ .

A.Nitrogen trifluoride, beryllium difluoride, water, 1,3-dichlorobenzene
B.Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene✓
C.Ammonia, beryllium difluoride, water, 1,4-dichlorobenzene
D.Boron trifluoride, hydrogen fluoride, carbon dioxide, 1,3-dichlorobenzene

Correct Answer

(B) Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene

Solution & Explanation

\textbf{Answer:} (B) Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene \textbf{Solution:} $BF X_{3}$ (trigonal planar), $BeF X_{2}$ (linear), $CO X_{2}$ (linear) and 1,4-(para)-dichlorobenzene are all symmetric, so their bond dipoles cancel to give net $μ = 0$ . $NF X_{3}$ , $H X_{2} O$ , $NH X_{3}$ , $HF$ and 1,3-(meta)-dichlorobenzene are unsymmetrical and have non-zero dipole moments.

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