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(D) Compounds containing the $CHO$ group (aldehydes) reduce Tollen's reagent to form a silver mirror.$1$. $CH_3(CHOH)_3CHO$ is an aldose (sugar),which

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All of these

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(D) Compounds containing the $CHO$ group (aldehydes) reduce Tollen's reagent to form a silver mirror.$1$. $CH_3(CHOH)_3CHO$ is an aldose (sugar),which contains an aldehyde group and gives the test.$2$. $CH_3COCHOHCH_3$ is an $\alpha$-hydroxy ketone. $\alpha$-hydroxy ketones are oxidized by Tollen's reagent to dicarbonyl compounds,thus giving a positive silver mirror test.$3$. $HCOOH$ (formic acid) contains an aldehyde-like hydrogen atom attached to a carbonyl group,which allows it to reduce Tollen's reagent.Therefore,all of these substances give the silver mirror test.

Which of the following substances will give the silver mirror test?

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