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


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



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