Chemical Bonding And Molecular Structure Question 385

Question: $ BF_3 $ and $ NF_3 $ both molecules are covalent, but $ BF_3 $ is non-polar and $ NF_3 $ is polar. Its reason is [CPMT 1989; NCERT 1980]

Options:

A) In uncombined state boron is metal and nitrogen is gas

B) $ B-F $ bond has no dipole moment whereas $ N-F $ bond has dipole moment

C) The size of boron atom is smaller than nitrogen

D) $ BF_3 $ is planar whereas $ NF_3 $ is pyramidal

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Answer:

Correct Answer: D

Solution:

$ BF_3 $ is planar while $ NF_3 $ is pyramidal due to the presence of lone pair of electron on nitrogen in $ NF_3 $ .



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