Question

Which one of the following statements is not true for glucose?

• A. $ \alpha -D(+)- $ glucose undergoes mutarotation
• B. It has four asymmetric carbons is Fischer projection formula
• C. It gives saccharic acid with Tollens reagent
• D. It reacts with hydroxyl amine

Answer 1

Answer: (C)

Glucose reduces Tollens reagent and gets oxidised into gluconic acid. $ \underset{C{{H}_{2}}OH}{\overset{CHO}{\mathop{\underset{|}{\overset{|}{\mathop{(CHOH)}}}\,}}}\,+A{{g}_{2}}O\xrightarrow{{}}\underset{\begin{smallmatrix} C{{H}_{2}}OH \\ gluconic\,acid \end{smallmatrix}}{\overset{COOH}{\mathop{\underset{|}{\overset{|}{\mathop{{{(CHOH)}_{4}}}}}\,}}}\,+\underset{\begin{smallmatrix} \text{silver} \\ \text{mirror} \end{smallmatrix}}{\mathop{2Ag}}\, $