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ExamsNEETChemistry

Which is the most suitable reagent among the following to distinguish compound (3) from rest of the compounds? 1. CH3−C≡C−CH3 2. CH3−CH2−CH2−CH3 3. CH3−CH2C≡CH 4. CH3−CH=CH2

  1. Bromine in carbon tetrachloride
  2. Bromine in acetic acid
  3. Alk. KMnO4
  4. Ammoniacal silver nitrate

Correct answer: Ammoniacal silver nitrate

Solution

Compound (3) contains a terminal alkyne (-C≡CH group), which reacts with ammoniacal silver nitrate to form a white precipitate of silver acetylide. The other compounds do not have a terminal alkyne and will not react similarly.

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