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Among the reagents Br2 in CCl4 (a), Br2 in CH3COOH (b), alkaline KMnO4 (c), and ammoniacal AgNO3 (d), all unsaturated compounds like 1, 3, and 4 react with (a), (b), and (c), while only terminal alkynes such as 3 react with (d). Which reagent can be used to differentiate compound 3 from compounds 1, 2, and 4?

1. Bromine dissolved in carbon tetrachloride
2. Bromine in acetic acid
3. Alkaline potassium permanganate
4. Silver nitrate in ammonia solution

Correct answer: Silver nitrate in ammonia solution

Solution

Ammoniacal AgNO3 reacts specifically with terminal alkynes to form a white precipitate of silver acetylide, distinguishing them from other unsaturated compounds.

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