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  4. The compound responds to Tollen's reagent is:

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Q. The compound responds to Tollen's reagent is:

AFMCAFMC 2002

Solution:

Tollen's reagent is ammoniacal silver nitrate solution. It is prepared as follows
$AgNO _{3}+\underset{\text { (excess) }}{ NH _{4} OH } \longrightarrow \underset{\text { Tollen's reagent }}{\left[ Ag \left( NH _{3}\right)_{2}\right] OH }+ H _{2} O$
Tollen's reagent is a mild oxidising agent and oxidise only aldehydes to form silver mirror. It is used to differentiate between aldehydes and ketones
$R CHO + 2\left[Ag \left( NH _{3}\right)_{2}\right] OH \longrightarrow $
$R COONH _{4}+\underset{\text{Silver mirror}}{2 Ag \downarrow}+3 NH _{3}+ H _{2} O$