1.

In the reaction \[N{{H}_{3}}+B{{F}_{3}}\] ⇌ \[N{{H}_{3}}\to B{{F}_{3}},\,\,B{{F}_{3}}\] is [MP PMT 1989; MHCET 2001]

A.      Lewis acid
B.      Lewis base
C.      Neither Lewis acid nor Lewis base
D.      Lewis acid and Lewis base both
Answer» B.      Lewis base


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