Question

Identify the molecule/ion with the strongest tendency to act as a Lewis acid.

• A. $C{H}_3^{+}$
• B. $C{N}^{-}$
• C. $N{H}_3$
• D. $B{F}_4^{-}$
• E. $C{O}_2$

Answer 1

The correct option is A $C{H}_3^{+}$

Since lewis acids are electron deficient species, So they have more tendency to gain electron.

${CH}_3^{+}$ (has only six valence $e^{-}$)

So, to complete its object it need $2$ more $e^{-}$. Thus it has a strongest tendency to act as a Lewis acid.