Q45 of 312 Page 263

What is meant by an addition reaction? Give an example (with equation) of an addition reaction of an alkene.

The reaction in which a substance adds completely on a another substance without the removal of small molecules are called addition reactions. Addition reaction is a characteristic of unsaturated hydrocarbons (like alkenes and alkynes).

Example: Ethene reacts with hydrogen when heated in the presence of nickel catalyst to form ethane.




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