Positive Tollen's test is observed for

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(A) Tollen's reagent is an oxidizing agent that oxidizes aldehydes to carboxylate ions. $(A)$ is acrolein (an $\alpha, \beta$-unsaturated aldehyde),wh

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$A, B, C$

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(A) Tollen's reagent is an oxidizing agent that oxidizes aldehydes to carboxylate ions. $(A)$ is acrolein (an $\alpha, \beta$-unsaturated aldehyde),which gives a positive Tollen's test. $(B)$ is benzaldehyde (an aromatic aldehyde),which gives a positive Tollen's test. $(C)$ is benzoin (an $\alpha$-hydroxyketone),which is oxidized by Tollen's reagent to benzil,thus giving a positive Tollen's test. $(D)$ is chalcone (an $\alpha, \beta$-unsaturated ketone),which does not give a positive Tollen's test. Therefore,compounds $(A)$,$(B)$,and $(C)$ give a positive Tollen's test.

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