what is meant by addition reaction
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An addition reaction, in organic chemistry, is in its simplest terms an organic reactionwhere two or more molecules combine to form a larger one (the adduct).[1][2]
Addition reactions are limited to chemical compounds that have multiple bonds, such as molecules with carbon–carbon double bonds(alkenes), or with triple bonds (alkynes). Molecules containing carbon—hetero double bonds like carbonyl (C=O) groups, or imine(C=N) groups, can undergo addition, as they too have double-bond character.
An addition reaction is the reverse of an elimination reaction. For instance, the hydration of an alkene to an alcohol is reversed by dehydration.
There are two main types of polar addition reactions: electrophilic addition and nucleophilic addition. Two non-polar addition reactions exist as well, called free-radical addition and cycloadditions. Addition reactions are also encountered in polymerizations and called addition polymerization.
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ADDITION REACTIONS :
Unsaturated hydrocarbons add hydrogen in the presence of catalysts such as palladium or nickel to give saturated hydrocarbons, this is called the addition reaction.
The reaction is commonly used in the hydrogenation of vegetable oils using a nickel Vegetable oils generally have long unsaturated carbon chains.
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