Which of the following is a Lewis acid ?

Options

A. `BF_(3)`
B. `SnCI_(4)`
C. `CO_(2)`
D. All of these

Answer

D

Explanation

Molecules having central atoms with incomplete octets are Lewis acids. Examples are `BF_(3), BeCI_(2)`, and `AICI_(3)`. Moecules having central atoms capable of octet expansion are Lewis acids, e.g., `SnCI_(4)`, `PF_(5)`, and `PtCI_(4)`. Molecules containing `pi` bonds betweeen atoms having signifacant electronagativity difference can act as Lewis acids, e.g., `CO_(2)`.