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Q.

The addition of hydrogen to an unsaturated carbon compound across a double or triple bond is called


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a

Substitution reaction  

b

Elimination reaction

c

Hydrogenation reaction

d

Addition reaction

answer is C.

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Detailed Solution

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Hydrogenation reaction is the addition of hydrogen to an unsaturated carbon compound across a double or triple bond.
The addition of hydrogen to an unsaturated hydrocarbon molecule in presence of Ni/Pt catalyst is said to be a hydrogenation reaction. It can be explained by the following example:           CH≡CH+H2+Ni→CH2=H2C+H2+Ni→ CH3-CH3
 Ethyne                              Ethene                                    Ethane
 CH2=H2C+H2+Ni→CH3-CH3
    Ethene                                   Ethane
 
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The addition of hydrogen to an unsaturated carbon compound across a double or triple bond is called