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Four compounds A, B, C and D were heated individually with Tollen’s reagent. It was found that all compounds other than D formed a silver mirror on the inside of their test tubes. Identify the compound D.

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Four compounds A, B, C and D were heated individually with Tollen’s reagent. It was found that all compounds other than D formed a silver mirror on the inside of their test tubes. Identify the compound D.

(a) Acetaldehyde

(b) Butyraldehyde

(c) Acetone

(d) Benzaldehyde

This question was addressed to me in an interview.

My doubt is from Aldehydes and Ketones Chemical Reactions in chapter Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

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Right answer is (c) Acetone

Explanation: When aldehydes are heated with ammoniacal silver nitrate solution (Tollen’s reagent), it reduces the silver ions to metallic silver and forms a silver mirror. Ketones do not give this test as they are different to oxidise.

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