$\text{3 HC}\equiv \text{CH}\underset{ }{\overset{\text{A}}{\to }}\text{B}$

If the catalyst A favors the linear polymerization of Acetylene find A & B in the reaction 

• A

  B is Divinyl-Acetylene,${\text{A=Cu}}_{\text{2}}{\text{Cl}}_{\text{2}}{\text{, NH}}_{\text{4}}\text{OH}$

• B

  B is vinyl-Acetylene,${\text{A=Cu}}_{\text{2}}{\text{Cl}}_{\text{2}}{\text{, NH}}_{\text{4}}\text{OH}$

• C

  B is vinyl-Acetylene,${\text{A=Cu}}_{\text{2}}{\text{Cl}}_{\text{2}}{\text{, NH}}_{\text{4}}\text{Cl}$

• D

  B is Divinyl-Acetylene,${\text{A=Cu}}_{\text{2}}{\text{Cl}}_{\text{2}}{\text{, NH}}_{\text{4}}\text{Cl}$