Question

Which statement(s) is/are correct?
I) Benzene decolourises bromine water.
II) Benzene decolourises alkaline permanganate solution.
III) Acetylene decolourises alkaline permanganate solution.
IV) Acetylene decolourises bromine water.

• A. III and IV
• B. II and III
• C. I and IV
• D. I and II

Answer 1

The correct option is A III and IV

Benzene being an extremely unsaturated compound with three double bonds does not give addition reactions. Benzene does not decolourise bromine water and potassium permanganate.

Acetylene being a linear molecule with a carbon-carbon triple bond can unite with metals. It decolourises potassium permanganate as well as bromine water.