Classify each of the following as a Lewis acid or a Lewis base. Lewis acid Lewis base
Lewis Acid is an electron pair acceptor and Lewis base is an electron pair donor.
BeCl2: Here Be has an incomplete octet and can therefore accept electrons
SO2 : Here S atom gains its octet via multiply bonding with one of the O atoms. Such molecules behave as lewis acids
Fe3+ : It has vacant d-orbitals that can accept electrons
H2O : lone pair on O atom for donation
I-: negative charge, electron pair for donation