Question

Which of the following is Lewis base: AlCl3, CO, CO2, or BF3?

Answer 1

`"CO"`

Explanation:

`"AlCl"_3` , `"BF"_3` , and `"CO"_2` are Lewis acids, as they accept a pair of electrons from another species during the formation of a co-ordinate bond. Therefore, the Lewis base here is `"CO"`.