Question

Which of the following will decolourise alkaline $KMnO_4$ solution?

• A. $C_3 H_8$
• B. $CH_4$
• C. $CCL_4$
• D. $C_2 H_4$

Answer 1

Answer: (D)

$C_2 H_4$

Answer 2

Unsaturated compounds which contain C = C or C $\equiv$ C, decolourises the purple colour of alkaline $KMnO_4$ solution.