How to get C2H2 from C2H4CL?

1. Let’s write down the chain of transformations:
H2CCl – CH2Cl – C2H4 (OH) 2 – C2H4 – C2H2;
2. Let’s name the substances: dichloroethane, ethanediol, ethylene, acetylene;
3. Let’s compose the equations:
Н2СCl – CH2Cl + 2KOH = H2C – (OH) – CH2 – (OH) – exchange reaction, ethanediol is released;
Н2С – (ОН) – СН2 – (ОН) = 2Н2О + Н2С = СН2 – dehydration, ethylene was obtained;
Н2С = СН2 = Н2 + С2Н2 – dehydrogenation, acetylene is released;
The above reactions confirm the bond of alkanes, alkenes, alcohols, as well as the synthesis of alkynes. The end product of the reaction, acetylene, is used to produce benzene.