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. $\underset{C{H}_{2}OH}{\stackrel{CHO}{\underset{|}{\stackrel{|}{(CHOH)}}}}+A{g}_{2}O\to \underset{\begin{array}{c}C{H}_{2}OH\\ gluconicacid\end{array}}{\stackrel{COOH}{\underset{|}{\stackrel{|}{{(CHOH)}_4}}}}+\underset{\begin{array}{c}\text{silver}\\ \text{mirror}\end{array}}{2Ag}$