37. Формула вещества Х в цепочке превращений

The reaction shows methane (CH4) undergoing incomplete decomposition to form substance X. Incomplete decomposition of methane can yield acetylene (C2H2) and hydrogen. The subsequent reaction shows acetylene reacting with H2 and Ni (catalyst) to form ethene (C2H4). Therefore, X is acetylene.

Answer: б) C2H2.