Question

In the following reaction,
$N{H}_3+B{F}_3\to N{H}_3\to B{F}_3$
which behaves like Lewis base?

• A. $N{H}_3$
• B. $B{F}_3$
• C. $N{H}_3\to B{F}_3$
• D. None of these

Answer 1

Answer: (A)

According to Lewis concept, Lewis base is electron pair donor and Lewis acid is electron pair acceptor. Hence, $N{H}_3$ behaves as Lewis base and $B{F}_3$ as Lewis acid.
$\underset{donor}{H_3{N}_{\bullet }^{\bullet }}+\underset{acceptor}{B{F}_3}\to H_{3}N\to B{F}_3$