Question

An organic compound with the formula $C_6H_{12}O_6$ forms a yellow crystalline solid with phenylhydrazine and gives a mixture of sorbitol and mannitol when reduced with sodium. Which among the following could be the compound ?

• A. Fructose
• B. Glucose
• C. Mannose
• D. Sucrose

Answer 1

Answer: (A)

Fructose

Answer 2

As $C_6H_{12}O_6$ forms a crystalline osazone with phenylhydrazine, it must be an aldohexose or ketohexose. As the compound on reduction with Na gives sorbitol and mannitol, the given compound is fructose.