Question

short note on substituion reaction

Answer 1

A substitution reaction is a reaction in which an atom or a group of atom 
substitutes another atom in an organic compound 
FOR EXAMPLE :
chlorination of alkanes occurs by substitution of H-ATOM in alkane by Cl-ATOM
the reaction is her:

Answer 2

Substitution reaction is a chemical reaction during which one functional group in a chemical compound is replaced by another functional group