The presence of a triple bond within the C3H4 molecule is verified by its distinct chemical reaction with____________?
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Answer: D. Ammonical silver nitrate
Explanation
Terminal alkynes possess acidic protons attached directly to triple-bonded carbon atoms. Ammoniacal silver nitrate reacts with these terminal alkynes to form insoluble precipitates. This precipitation reaction provides a reliable chemical test to confirm triple bond locations. Alkynes are unsaturated hydrocarbons containing at least one carbon-carbon triple bond. Ammoniacal silver nitrate is commonly known as Tollens reagent in organic laboratory testing. Silver acetylides precipitate out of solution as heavy white or yellowish solid materials.
Analytical chemistry uses specific reagent tests to identify unknown functional groups in compounds. Distinguishing terminal alkynes from internal alkynes is essential for structural organic analysis. Metal acetylides formed during these tests can be explosive when completely dry. Bromine water tests for general unsaturation by reacting with both double and triple bonds. Bayers reagent uses alkaline potassium permanganate to detect double bonds via diol formation. Fehling solution is specifically utilized to detect reducing sugars and aldehyde functional groups.
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