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(D) Alkynes contain a triple bond $(C \equiv C)$,which makes them highly reactive and capable of undergoing various types of reactions:$1$. Addition:

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All of these

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(D) Alkynes contain a triple bond $(C \equiv C)$,which makes them highly reactive and capable of undergoing various types of reactions:$1$. Addition: Alkynes undergo electrophilic addition reactions,such as hydrogenation: $CH \equiv CH + 2H_2 \xrightarrow{Ni} CH_3 - CH_3$.$2$. Substitution: The terminal hydrogen atoms in alkynes are acidic and can be replaced by metals: $CH \equiv CH + Na \xrightarrow{liq. NH_3} CH \equiv C^{-} Na^{+} + \frac{1}{2} H_2$.$3$. Polymerization: Alkynes can undergo cyclic polymerization to form aromatic compounds: $3CH \equiv CH \xrightarrow{	ext{hot } Cu 	ext{ tube}} C_6H_6$ (Benzene).Since alkynes exhibit all these reactions,the correct option is $(d)$.

Which of the following reactions is shown by alkynes?

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