Question Detail
Question
Which one of the following compounds will (a) decolorizes dilute cold KMnO4 ; (b) decolorizes bromine water ; and (c) gives a white precipitate with ammoniacal AgNO3 solution.
Correct Answer
Option B is the correct answer.
Detailed Explanation
1-Hexyne is a terminal alkyne: it decolorizes KMnO4 and bromine water due to unsaturation, and forms a white precipitate (silver acetylide) with ammoniacal AgNO3 due to the acidic terminal alkyne hydrogen. Alkenes only do (a) and (b), while internal alkynes do not do (c).
Hint
Which compound has a terminal alkyne group and will give all three tests?