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
Show Answer
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 $ .
