Multiple choice

A hydrocarbon gas decolourises alkaline potassium permanganate and gives precipitate with ammonical silver nitrate. This gas is

  1. CH4

  2. C2H

  3. C2H2

  4. C2H6
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Acetylene (C2H2) is an alkyne with a triple bond. It decolorizes alkaline KMnO4 due to unsaturation and forms a white precipitate of silver acetylide with ammoniacal AgNO3. Methane (C2H6 is ethane, C2H4 is ethene, C2H is not a stable hydrocarbon) do not give both reactions.

Keep practicing — related questions