A) \[C{{u}_{2}}O\]
B) \[Cu\]
C) \[CuO\]
D) \[CuS{{O}_{4}}\]
Correct Answer: A
Solution :
When acetaldehyde is heated with Fehling solution, a red precipitate of \[\text{C}{{\text{u}}_{\text{2}}}\text{O}\]is obtained. \[C{{H}_{3}}CHO+2Cu{{(OH)}_{2}}+NaOH\xrightarrow{{}}\] \[C{{H}_{3}}COONa+\underset{\text{red}}{\mathop{C{{u}_{2}}O\downarrow }}\,+3{{H}_{2}}O\]
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