Question

Match the acid/base in List I with their nature in List II

Answer 1

Lewis Acid: a species that accepts an electron pair (i.e., an electrophiles and electron deficient molecules) and will have vacant orbitals $B{F}_3$

Lewis Base: a species that donates an electron pair (i.e., a nucleophile) and will have lone-pair electrons $N{F}_3$

An acid is a proton (hydrogen ion $H^{+}$) donor. e.g. $HS{O}_4^{-}$

A base is a proton (hydrogen ion $H^{+}$) acceptor $HS{O}_4^{-},O{H}^{-}$