1.

Electrophilic addition reaction is easily given by

Answer»

Acetylene
Ethene
Ethane
Benzene

Solution :Inspite of the fact that the two `PI`-bonds are present in alkynes, these are less reactive than ALKENES towards addition reactions (due to symmetrical cylindrical nature of `pi`-electron cloud). Further , alkynes do not show geometrical isomerism due to their LINEAR structure.
The `pi`-electrons of alkynes are more tightly attached to the carbon atoms than `pi`-electrons in alkene and hence less easily AVAILABLE for addition reactions with electrophiles. As a result, alkynes are less reactive than alkenes towards electrophilic addition reaction . A majority of addition reactions of alkynes are catalysed by heavy metal ions such as `Hg^(2+)` and `Ba^(2+)`, etc., while no such catalysts are needed in case of electrophilic addition reactions to alkenes.


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