Question

CaCO3→CaC2→C2H2→C2H4→C2H5Cl

Answer 1

1) CaCO3—>CaO+CO2, CaO+3C—>CaC2+CO
2) CaC2+2HOH—>C2H2+Ca(OH)2
3) C2H2+H2(t, Ni)—>CH2=CH2
4) CH2=CH2+HCl —>CH3-CH2-Cl