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(D) Acetylene $(HC \equiv CH)$ undergoes nucleophilic addition reactions due to the presence of $\pi$-electrons.$1$. Addition of water: In the presenc

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(D) Acetylene $(HC \equiv CH)$ undergoes nucleophilic addition reactions due to the presence of $\pi$-electrons.$1$. Addition of water: In the presence of $Hg^{2+}$ and $H_2SO_4$,water adds to acetylene to form vinyl alcohol,which tautomerizes to acetaldehyde. This is a nucleophilic addition process.$2$. Addition of $HCN$: The cyanide ion $(CN^-)$ acts as a nucleophile and attacks the triple bond of acetylene.$3$. Addition of $AsCl_3$: The reaction of acetylene with $AsCl_3$ in the presence of $AlCl_3$ (Lewis acid) is known as the Lewis-Arsenic reaction,which is a type of nucleophilic addition resulting in the formation of $\beta$-chlorovinylarsine derivatives.Since all the given reactions involve nucleophilic attack on the alkyne,the correct option is $D$.

Which of the following is(are) example$(s)$ of nucleophilic addition reaction in the case of acetylene?

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