[IIT 1987; Kurukshetra CEE 1998; CPMT 1999]
A) $ NF_3 $
B) $ NCl_3 $
C) $ NBr_3 $
D) $ NI_3 $
Correct Answer: A
$ NF_3 $ It is least basic because of the high electronegativity of $ 3F $ atoms. The lone pair present on nitrogen atom is not easily available for donation.
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