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Question

Chemistry Question on Biomolecules

Glucose on reaction with Fehling solution gives

A

cupric oxide

B

cuprous oxide

C

saccharic acid

D

both (b) and (c)

Answer

cuprous oxide

Explanation

Solution

C5H11O5CHOglucose+CuO(from Fehling solution)   →OH−  C5H11O5COOHgluconic acid+Cu2Ocuprous  oxide (red ppt.)\underset {glucose}{C_5 H_{11} O_5 CHO} + \underset {(from \\\ Fehling \\\ solution)}{CuO} \ \ \ \xrightarrow {OH^-} \ \ \underset {gluconic \ acid}{C_5 H_{11} O_5 COOH} + \underset {cuprous \\\ \ oxide \\\ (red \ ppt.)}{Cu_2 O}