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Q. The hydrocarbon which does decolourise alkaline $KMnO_{4}$ solution and also does not give any precipitate with ammoniacal silver nitrate is

AIIMSAIIMS 2007

Solution:

Benzene is resonance stabilised and hence does not react with alk. $KMnO _{4}$ and it has no acidic hydrogen. Therefore, it does not react with ammoniacal $AgNO _{3}$ solution.