Identify Lewis acids and Lewis bases in each of the following reactions.

Identify Lewis acids and Lewis bases in each of the following reactions.

a. SiCl4 + 2Cl– Æ [SiCl6] 2–                        b. PF5 + F– Æ [PF6] ¯             c. Cu2+ + 4NH3 Æ [Cu(NH3)4] 2+

d. CO2 + H2O Æ H2CO3                             e. Ni + 4CO Æ Ni(CO)4