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(D) The reaction is the acid-catalyzed hydrolysis of an enol ether. The substrate is $CH_2=C(CH_3)-O-CH=CH_2$.Acid hydrolysis of this enol ether yield

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All of these

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(D) The reaction is the acid-catalyzed hydrolysis of an enol ether. The substrate is $CH_2=C(CH_3)-O-CH=CH_2$.Acid hydrolysis of this enol ether yields an aldehyde and a ketone.The hydrolysis of the vinyl ether part $(CH_2=CH-O-)$ yields acetaldehyde $(CH_3CHO)$.The hydrolysis of the isopropenyl ether part yields acetone $(CH_3COCH_3)$.Thus,$P$ and $Q$ are acetaldehyde $(CH_3CHO)$ and acetone $(CH_3COCH_3)$.Acetaldehyde is an aldehyde,which gives a positive test with Tollen's reagent,Fehling's solution,and Benedict's solution.Acetone is a ketone,which does not give a positive test with any of these reagents.Therefore,all of these reagents can be used to distinguish between $P$ and $Q$.

In the above sequence,$P$ and $Q$ products can be distinguished by?

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