Question

Which does not reacts with Fehling solution?

• A. $C{{H}_{3}}CHO$
• B. ${{C}_{6}}{{H}_{5}}CHO$
• C. $C{{H}_{3}}COC{{H}_{3}}$
• D. Glucose

Answer 1

Answer: (C)

$C{{H}_{3}}COC{{H}_{3}}$

Answer 2

Aldehydes react with Fehling's solution and form acid and reddish brown ppt. of cuprous oxide. Ketones does not react with Fehling's solution. Hydrogen atom of the aldehydic group is easily oxidized, hence they reduce mild oxidizing agents like Fehling's solution. $R-CHO+2CuO\to R-COOH+C{{u}_{2}}O\downarrow$