Question

Acetylene reacts with chlorine gas in the presence of sunlight to form ______.

Options

• carbon

• 1, 2-dichloroethane

• 1,1,2,2-tetrachloroethane

• ethane

Answer 1

Acetylene reacts with chlorine gas in the presence of sunlight to form carbon.

Explanation:

In the presence of direct sunlight, the reaction between acetylene (Cl₂) and chlorine gas (H₂) is highly violent and explosive. Chlorine completely strips the hydrogen away from acetylene, leaving behind pure carbon (black soot) and hydrochloric acid:

\[\ce{C2H5 + Cl2 ->[Sunlight] 2C + 2HCl}\]