• A Lewis acid is a lone pair acceptor and a Lewis base is a lone pair donor.

• When a Lewis base reacts with a Lewis acid a coordinate bond is formed.

• A nucleophile is a Lewis base and an electrophile is a Lewis acid.

• Application of Lewis’ acid–base theory to inorganic and organic chemistry to identify the role of the reacting species.

• Both organic and inorganic examples should be studied.

• Relations between Brønsted–Lowry and Lewis acids and bases should be discussed.