Question

Which of these is least likely to act as Lewis base?

• A. $BF_{3}$
• B. $NH_{3}$
• C. $OH^{-}$
• D. Ethylene

Answer 1

Answer: (A)

$BF_{3}$

Answer 2

Lewis bases are electron pair donors or nucleophiles. $BF_3$ is a Lewis acid, in which the central atom $B$ has incomplete octet.