Question

Chlorine replaces hydrogen from the hydrocarbons to produce various products. This type of reaction is called ______ reaction.

• A. substitution
• B. addition
• C. hydrogenation
• D. combination

Answer 1

The correct option is A substitution

The reaction in which one atom or a group of atoms is replaced by another atom or group of atoms is called substitution reaction. Here, hydrogen atom is replaced by chlorine atom to form a new compound.
${\mathrm{CH}}_4\left(g\right)+{\mathrm{Cl}}_2\left(g\right)\underset{}{\overset{\mathrm{sunlight}}{\to }}{\mathrm{CH}}_3\mathrm{Cl}\left(g\right)+\mathrm{HCl}\left(g\right)$

This process is endothermic because energy is absorbed.