Объяснение:
CaC2 + 2H2O = Ca(OH)2 + CH=-CH
CH=-CH + HBr -> CH2=CH-Br
CH2=CH-Br + KOH -> CH=-CH + KBr + H2O
CH=-CH + 2[Ag(NH3)2]OH -> Ag-C=-C-Ag + 4NH3 + 2H2O
Ag-C=-C-Ag + 2CH3-Br -> CH3-C=-C-CH3 + 2AgBr
