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(D) Glucose $(C_5H_{11}O_5CHO)$ acts as a reducing sugar and reacts with Fehling solution ($Cu^{2+}$ in alkaline medium).During this reaction,the alde

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both $(b)$ and $(c)$

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(D) Glucose $(C_5H_{11}O_5CHO)$ acts as a reducing sugar and reacts with Fehling solution ($Cu^{2+}$ in alkaline medium).During this reaction,the aldehyde group of glucose is oxidized to a carboxylic acid group,forming gluconic acid $(C_5H_{11}O_5COOH)$.Simultaneously,the $Cu^{2+}$ ions in the Fehling solution are reduced to $Cu^+$ ions,which precipitate as red cuprous oxide $(Cu_2O)$.The chemical reaction is: $C_5H_{11}O_5CHO + 2Cu^{2+} + 5OH^- \rightarrow C_5H_{11}O_5COO^- + Cu_2O + 3H_2O$.Thus,both cuprous oxide and gluconic acid are produced.

Glucose on reaction with Fehling solution gives

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