A) \[C{{H}_{3}}CHO\]
B) \[C{{H}_{3}}COOH\]
C) \[C{{H}_{3}}-\underset{O}{\mathop{\underset{||}{\mathop{C}}\,}}\,-C{{H}_{3}}\]
D) \[C{{H}_{3}}-C{{H}_{2}}COOH\]
Correct Answer: A
Solution :
Key Idea: Only aldehydes react with both Tollens reagent and Fehlings solution. \[\underset{\text{aldehyde}}{\mathop{\underset{(a)}{\mathop{C{{H}_{3}}CHO}}\,}}\,\] \[\underset{\text{acid}}{\mathop{\underset{(b)}{\mathop{C{{H}_{3}}COOH}}\,}}\,\] \[\underset{\text{ketone}}{\mathop{\underset{(c)}{\mathop{C{{H}_{3}}COC{{H}_{3}}}}\,}}\,\] \[\underset{\text{acid}}{\mathop{\underset{(d)}{\mathop{C{{H}_{3}}C{{H}_{2}}COOH}}\,}}\,\] \[C{{H}_{3}}CHO\] (ethanal) is the only aldehyde in given choices. So, it reacts with both Tollens reagent and Fehling solution \[\underset{\text{(Tollen }\!\!\!\!\text{ s}\,\text{reagent)}}{\mathop{\text{C}{{\text{H}}_{\text{3}}}\text{CHO}\,\text{+ Ammoniacal}\,\text{AgN}{{\text{O}}_{\text{3}}}\to \text{Ag}\,\text{mirror}}}\,\]\[\underset{\text{with}\,\text{tartarate}\,\text{anion}}{\mathop{\text{C}{{\text{H}}_{\text{3}}}\text{CHO}\,\text{+}\,\text{C}{{\text{u}}^{\text{2+}}}\text{+}\,\text{ions}\,\text{complexed}}}\,\,\to \underset{\text{red}\,\text{ppt}\text{.}}{\mathop{\text{C}{{\text{u}}_{\text{2}}}\text{O}}}\,\]
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