Verified answer

C + 2H2 --> CH4↑

2CH4 (t*)--> C2H2↑ + 3H2↑

C2H2 + H2 (t*, кат)--> C2H4 ↑

C2H4 + H2O (t*, H2SO4)--> C2H5OH

C2H5OH + HCl (кат)--> C2H5Cl↑ + H2O