Question

Which of the following will decolourise alkaline $KMn{O}_4$ solution?

• A. $C_3{H}_8$
• B. $C{H}_4$
• C. $CC{l}_4$
• D. $C_2{H}_4$

Answer 1

Answer: (D)

Unsaturated compounds which contain $C=C$ or $C\equiv C$, decolourises the purple colour of alkaline $KMn{O}_4$ solution.