A) Lucas test
B) Tollens reagent
C) Molishtest
D) none of these
Correct Answer: B
Solution :
Key Idea: The reagent used to distinguish aldehydes and ketones is one with which either aldehyde or ketone reacts. [a] Lucas test: It is used to distinguish between \[{{1}^{o}},{{2}^{o}}\] and \[{{3}^{o}}\] alcohols. The Lucas reagent is anhydrous \[ZnC{{l}_{2}}\] and cone. \[HCl\]. [b] Tollens reagent: It is ammoniacal silver nitrate solution. Aldehydes reduce it to silver mirror whereas ketones dont react with it. So, Tollens reagent is used to distinguish between aldehydes and ketones. [c] Molisch test: It is used to detect the presence of carbohydrate in solution. Formation of violet coloured ring at the junction of ale. a-naphthol solution and cone. \[{{H}_{2}}S{{O}_{4}}\] shows the presence of carbohydrate in the food.
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