Explanation:

\({\text{CH}} \equiv {\text{CH}}\xrightarrow[{{\text{B}}{{\text{a}}^{{\text{2 + }}}}}]{{{\text{HCN}}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{ = CHCN}}\)

Explanation:

\(\mathop {{\text{H}} - {\text{C}} \equiv {\text{C}} - {\text{H}}}\limits_{{\text{Acetylene}}} \xrightarrow[{{\text{H}}{{\text{g}}^{2 + }}}]{{2{\text{C}}{{\text{H}}_3}{\text{COOH}}}}\)
\({\text{C}}{{\text{H}}_3} - \mathop {{\text{CH}}{{\left( {{\text{OCOC}}{{\text{H}}_3}} \right)}_2}}\limits_{{\text{ethylidene acetate }}} {\text{ }}\)

Explanation:

Explanation:

Cuprous chloride solution with ammonia is known as ammonical cuprous chloride solution. All terminal alkynes behaves as very weak acids. Ammonical cuprous chloride reacts with acetylene to form reddish brown precipitate.
\(\begin{aligned}\mathrm{HC} \equiv \mathrm{CH}+\mathrm{Cu}_{2} \mathrm{Cl}_{2}+2 \mathrm{NH}_{4} \mathrm{OH} \longrightarrow \\\mathrm{Cu}-\mathrm{C} \equiv \mathrm{C}-\mathrm{Cu} \downarrow+2 \mathrm{NH}_{4} \mathrm{Cl}+2 \mathrm{H}_{2} \mathrm{O} \\\\\text { cuprous acetylide } \\\\\quad \text { (Reddish brown precipitate) }\end{aligned}\)

Explanation:

\({\text{CH}} \equiv {\text{CH}}\xrightarrow[{{\text{B}}{{\text{a}}^{{\text{2 + }}}}}]{{{\text{HCN}}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{ = CHCN}}\)

Explanation:

\(\mathop {{\text{H}} - {\text{C}} \equiv {\text{C}} - {\text{H}}}\limits_{{\text{Acetylene}}} \xrightarrow[{{\text{H}}{{\text{g}}^{2 + }}}]{{2{\text{C}}{{\text{H}}_3}{\text{COOH}}}}\)
\({\text{C}}{{\text{H}}_3} - \mathop {{\text{CH}}{{\left( {{\text{OCOC}}{{\text{H}}_3}} \right)}_2}}\limits_{{\text{ethylidene acetate }}} {\text{ }}\)

Explanation:

Explanation:

Cuprous chloride solution with ammonia is known as ammonical cuprous chloride solution. All terminal alkynes behaves as very weak acids. Ammonical cuprous chloride reacts with acetylene to form reddish brown precipitate.
\(\begin{aligned}\mathrm{HC} \equiv \mathrm{CH}+\mathrm{Cu}_{2} \mathrm{Cl}_{2}+2 \mathrm{NH}_{4} \mathrm{OH} \longrightarrow \\\mathrm{Cu}-\mathrm{C} \equiv \mathrm{C}-\mathrm{Cu} \downarrow+2 \mathrm{NH}_{4} \mathrm{Cl}+2 \mathrm{H}_{2} \mathrm{O} \\\\\text { cuprous acetylide } \\\\\quad \text { (Reddish brown precipitate) }\end{aligned}\)

Explanation:

\({\text{CH}} \equiv {\text{CH}}\xrightarrow[{{\text{B}}{{\text{a}}^{{\text{2 + }}}}}]{{{\text{HCN}}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{ = CHCN}}\)

Explanation:

\(\mathop {{\text{H}} - {\text{C}} \equiv {\text{C}} - {\text{H}}}\limits_{{\text{Acetylene}}} \xrightarrow[{{\text{H}}{{\text{g}}^{2 + }}}]{{2{\text{C}}{{\text{H}}_3}{\text{COOH}}}}\)
\({\text{C}}{{\text{H}}_3} - \mathop {{\text{CH}}{{\left( {{\text{OCOC}}{{\text{H}}_3}} \right)}_2}}\limits_{{\text{ethylidene acetate }}} {\text{ }}\)

Explanation:

Explanation:

Cuprous chloride solution with ammonia is known as ammonical cuprous chloride solution. All terminal alkynes behaves as very weak acids. Ammonical cuprous chloride reacts with acetylene to form reddish brown precipitate.
\(\begin{aligned}\mathrm{HC} \equiv \mathrm{CH}+\mathrm{Cu}_{2} \mathrm{Cl}_{2}+2 \mathrm{NH}_{4} \mathrm{OH} \longrightarrow \\\mathrm{Cu}-\mathrm{C} \equiv \mathrm{C}-\mathrm{Cu} \downarrow+2 \mathrm{NH}_{4} \mathrm{Cl}+2 \mathrm{H}_{2} \mathrm{O} \\\\\text { cuprous acetylide } \\\\\quad \text { (Reddish brown precipitate) }\end{aligned}\)

Explanation:

\({\text{CH}} \equiv {\text{CH}}\xrightarrow[{{\text{B}}{{\text{a}}^{{\text{2 + }}}}}]{{{\text{HCN}}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{ = CHCN}}\)

Explanation:

\(\mathop {{\text{H}} - {\text{C}} \equiv {\text{C}} - {\text{H}}}\limits_{{\text{Acetylene}}} \xrightarrow[{{\text{H}}{{\text{g}}^{2 + }}}]{{2{\text{C}}{{\text{H}}_3}{\text{COOH}}}}\)
\({\text{C}}{{\text{H}}_3} - \mathop {{\text{CH}}{{\left( {{\text{OCOC}}{{\text{H}}_3}} \right)}_2}}\limits_{{\text{ethylidene acetate }}} {\text{ }}\)

Explanation:

Explanation:

Cuprous chloride solution with ammonia is known as ammonical cuprous chloride solution. All terminal alkynes behaves as very weak acids. Ammonical cuprous chloride reacts with acetylene to form reddish brown precipitate.
\(\begin{aligned}\mathrm{HC} \equiv \mathrm{CH}+\mathrm{Cu}_{2} \mathrm{Cl}_{2}+2 \mathrm{NH}_{4} \mathrm{OH} \longrightarrow \\\mathrm{Cu}-\mathrm{C} \equiv \mathrm{C}-\mathrm{Cu} \downarrow+2 \mathrm{NH}_{4} \mathrm{Cl}+2 \mathrm{H}_{2} \mathrm{O} \\\\\text { cuprous acetylide } \\\\\quad \text { (Reddish brown precipitate) }\end{aligned}\)