Given below are two chemical equations.

a) CH₂ = CH₂ + H₂→ A

b)

Identify the compounds “A” and “B”. Name these reactions.

a) “A” is CH₃—CH₃ (ethane)

When an unsaturated hydrocarbon reacts with hydrogen, gives a saturated hydrocarbon. This reaction is called addition reaction.

CH₂ = CH₂ + H₂→ CH₃—CH₃ (A)

(unsaturated) (saturated)

Note: Unsaturated hydrocarbons are those which contain carbon to carbon double bonds C=C or carbon to carbon triple bonds -CΞC- in their molecules.

Saturated hydrocarbons are those organic compounds which contain carbon–carbon single bond.

b) CH₃—CH₃ + Cl₂→ CH₃—CH₂—Cl + HCl

Ethane Chloroethane

(A) (B)