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