A) ammonia
B) \[{{H}_{2}}S{{O}_{4}}\]
C) alkaline \[KMn{{O}_{4}}\]
D) Fehling solution
Correct Answer: D
Solution :
Aldehydes and ketones can be distinguished by Fehlings reagent (mild oxidising agent) \[Aldehydes\xrightarrow{Fehling\,reagent}Brown\,ppt.\] \[Ketones~\xrightarrow{Fehlmg\text{ }reagent}\text{ }No\text{ }reaction\] Besides this, Tollens reagent and Benedicts reagent can also be used as they give positive test with aldehydes but not with ketones.
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