Both $H C H O$ and $C H_{3} C H O$ give positive tests with:

Fehling's reagent

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Ammoniacal silver nitrate

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Schiff's reagent

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I_{2} + K O H

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Solution

The correct options are
A Fehling's reagent
C Schiff's reagent
D Ammoniacal silver nitrate
Both $H C H O$ and $C H_{3} C H O$ are aldehydes, so they give exclusive tests of aldehyde, i.e., Fehling's test, reaction with ammoniacal silver nitrate (Tollens reagent) and Schiff's test.

Iodoform test is only given by ethanal but not by formaldehyde.

Options A, B and C are correct.

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