1. Classification based on the nature of rearrangements of atoms

2. Classification based on the direction of the reaction

Classification based on the nature of rearrangements of atoms

 chemical reactions are classified as follows.

 (a) Combination reactions

(b) Decomposition reactions

(c) Single Displacement Reactions

d) Double Displacement Reactions

(e) Combustion Reactions

2. Classification based on the direction of the reaction

a)     Reversible Reactions

b)     Irreversible Reactions