Benzene hexachloride is obtained by addition of 'x' moles of CI₂ with C₆H₆ in the presence of UV/500K. The value of 'x' is

Benzene hexachloride, also known as hexachlorocyclohexane (C₆H₆Cl₆), is synthesized by the addition of chlorine (Cl₂) to benzene (C₆H₆) under ultraviolet (UV) light or sunlight. In this reaction, three moles of chlorine react with one mole of benzene to produce one mole of benzene hexachloride:

C₆H₆ + 3 Cl₂ → C₆H₆Cl₆

Therefore, the value of 'x' is 3.