What is a substitution reaction? Write the reaction involved in the chlorination of methane.

Explanation

i. The reaction in which one type of atom/group of atoms in a reactant is substituted by another atom/group of atom is called substitution reaction.
ii. Chlorination of methane is a substitution reaction which gives four different hydrocarbons as products.
a. `CH_(4)+Cl_(2)overset("Sunlight")rarrCH_(3)Cl+HCl`
b. `CH_(3)Cl+Cl_(2) overset("Sunlight")rarr CH_(2)Cl_(2)+HCl`
c. `CH_(2)Cl_(2)+Cl_(2) overset("Sunllight")rarr CHCl_(3)+HCl`
c. `CH_(2)Cl_(2)+Cl_(2) overset("Sunlight")rarr CHCl_(3)+HCl`
d. `CHCl_(3)+Cl_(2) overset("Sunlight")rarr"CCl"_(4)+HCl`