Which of the following pairs cannot be distin | vedclass

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(C) Tollen's reagent is used to distinguish between aldehydes and most ketones. Aldehydes (except formaldehyde,which is an exception in some contexts,

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$CH_3CHO, PhCH_2CHO$

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(C) Tollen's reagent is used to distinguish between aldehydes and most ketones. Aldehydes (except formaldehyde,which is an exception in some contexts,but generally all aldehydes) and alpha-hydroxy ketones give a positive Tollen's test (silver mirror). Formic acid $(HCOOH)$ also gives a positive Tollen's test because it contains an aldehydic group. In the pair $CH_3CHO$ and $PhCH_2CHO$,both are aldehydes and will both give a positive Tollen's test,thus they cannot be distinguished by this reagent.

Which of the following pairs cannot be distinguished by Tollen's reagent?

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