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Q.
Electrophilic addition reaction is easily given by
UP CPMTUP CPMT 2010Hydrocarbons
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