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CaC2-----A------B------D-----B
CaC2 + 2H2O -> C2H2 + Ca(OH)2
C2H2 + H2 -> C2H4
C2H4 + Br2 -> C2H4Br2
C2H4Br2 + Zn -> C2H4 + ZnBr2
A - etyn
B - eten
D - di-bromoetan