ACl2/CCl4−−−−−−→BC2H5OH/KOH−−−−−−−−−−→CDHydrolysis−−−−−−→CRed Hot Fe−−−−−−−→Benzene
Then the incorrect match is
B = C2H2
A = C2H4
D = CaC2
C = Simplest alkyne
A=C2H4;B=C2H4Cl2;C=C2H2;D=CaC2