Q. Which of the following set of molecules will have zero dipole moment ?
A) Boron trifluoride, hydrogen fluoride, carbon dioxide, 1,3-dichlorobenzene
B) Nitrogen trifluoride, beryllium difluoride, water, 1,3-dichlorobenzene
C) Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene
D) Ammonia, beryllium difluoride, water, 1,4-dichlorobenzene
Explanation
[Solution] $BF_3$ (trigonal planar), $BeF_2$ and $CO_2$ (linear) and 1,4-dichlorobenzene are all symmetrical, so their dipoles cancel. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.