Question

Which of the following is a Lewis acid?

• A. $PH_{3}$
• B. $B(CH_3)_3$
• C. $NaH$
• D. $NF_3$

Answer 1

Answer: (B)

$B(CH_3)_3$

Answer 2

The Lewis acid is a compound that can accept an electron pair.
Among the options provided:
PH 3 is a Lewis base because it can donate its lone pair of electrons.
B(CH 3)3 is a Lewis acid as it can accept a pair of electrons from a Lewis base.
NaH is a Lewis base as it can donate a pair of electrons to form a bond.
NF 3 is a Lewis base because it can donate a lone pair of electrons.

So, the correct option is (B): B(CH3)3