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Addition reactions with hydrogen takes place in unsaturated hydrocarbons which are Alkenes and Alkynes.

The General formulae for Alkenes and Alkynes are following:

Alkenes: C_nH_2n

Alkynes: C_nH_2n-2

The essential conditions required for an addition reaction to occur is:

1. Hydrocarbon should be unsaturated.

2. The addition of hydrogen to an unsaturated carbon.

The chemical equation giving the name of the reactant and the product of such a reaction is as follows:

When Ethene undergoes addition reaction with hydrogen in presence of Ni as a catalyst, the product formed is a saturated hydrocarbon which is Ethane. The chemical reaction is as follows:

This reaction is called Hydrogenation.