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1) how is addition reaction takes place give examples
An addition reaction occurs when two or more reactants combine to form a final product. This product will contain all the atoms that were present in the reactants. The following is a general equation for this type of reaction:
          A+B?C
Egs:

  1.The reaction between ethene and bromine to form 1,2-dibromoethane
C2H4+Br2?C2H4Br2

   2. The polymerization of a styrene monomer to form a polystyrene polymer

   3.Hydrogenation involves adding hydrogen (H2) to an alkene.

RCHCH2+H2?RCH2CH3

   4.Ethanol (CH3CH2OH) can be made from alkenes such as ethene (C2H4), through a hydration reaction like the one below. A hydration reaction is one where water is added to the reactants.

C2H4+H2O?CH3CH2OH

A catalyst is needed for this reaction to take place. The catalyst that is most commonly used is phosphoric acid.


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