Question

Which among the following compounds is obtained when glucose reacts with hydrogen cyanide?

Options

• Gluconic acid

• Glucose cyanohydrin

• Saccharic acid

• n-hexane

Answer 1

Glucose cyanohydrin

Explanation:

Glucose reacts with hydrogen cyanide to form glucose cyanohydrin.

\[\begin{array}{cc}
\phantom{.......................................................}\ce{OH}\\
\phantom{.....................................................}|\\
\ce{HOCH2 -\underset{\text{Glucose}}{(CHOH)4} -CHO + HCN -> HOCH2 -\underset{\text{Glucose cyanohydrln}}{(CHOH)4 - CH-CH}}
\end{array}\]

This reaction confirm the presence of a carboxyl group \[\begin{array}{cc}\backslash\phantom{......}\\\ce{C = O}\\
/\phantom{......}\\\end{array}\] in glucose.