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(A) Tollen's reagent is used to detect the presence of aldehydes. $I$ is an aldehyde (isobutyraldehyde),which gives a positive Tollen's test. $II$ is

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Only $II$

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(A) Tollen's reagent is used to detect the presence of aldehydes. $I$ is an aldehyde (isobutyraldehyde),which gives a positive Tollen's test. $II$ is an enol that tautomerizes to acetone (a ketone),which does not give a positive Tollen's test. $III$ is an enol that tautomerizes to an aldehyde (cyclohexanecarbaldehyde),which gives a positive Tollen's test. $IV$ is a hemiacetal,which exists in equilibrium with its open-chain aldehyde form in the presence of base,thus giving a positive Tollen's test. Therefore,only compound $II$ does not form a silver mirror.

Which among the following compounds does not form a silver mirror when treated with Tollen's reagent?

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