Chemical Bonding And Molecular Structure Question 475

Question: Which one of the following arrangements of molecules is correct on the basis of their dipole moments-

Options:

A) $ BF_3>NH_3>NF_3 $

B) $ BF_3>NF_3>NH_3 $

C) $ NH_3>BF_3>NF_3 $

D) $ NH_3>NF_3>BF_3 $

Show Answer

Answer:

Correct Answer: D

Solution:

  • Both $ NF_3 $ and $ NH_3 $ have identical shape and a lone pair of electrons on nitrogen. The dipole moment of $ NH_3 $ is higher than $ NF_3 $ due to different directions of moments of the N - F and N - H bond. BF is a symmetrical molecule. It has zero dipole moment.


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