CH₂=CH₂ + H₂ gives CH₃-CH₃ is an example of:

Answer:

CH₂=CH₂ + H₂ →CH₃– CH₃

Unsaturated hydrocarbons add hydrogen in the presence of catalysts such as palladium or nickel to give saturated hydrocarbons. This reaction is called the addition reaction.

Addition reaction

A chemical reaction in which two or more reactants combine to form a larger single product is known as an addition reaction. But only chemical compounds containing multiple bond character can undergo an addition reaction as a double or triple bond is usually broken to form the required single bonds.

Example:  Hydro chlorination of propane

CH₃CH = CH₂ + HCl → CH₃C⁺HCH₃ + Cl⁻ → CH₃CHClCH₃