Question
Question: Which of the following compounds will not form the given osazone on reacting with excess of phenylhy...
Which of the following compounds will not form the given osazone on reacting with excess of phenylhydrazine.
A
D-glucose
B
D-mannose
C
D-Idose
D
D-Fructose
Answer
D-Idose, D-Fructose
Explanation
Solution
The given osazone structure is derived from an aldose, specifically one with the configurations at C3, C4, and C5 as: C3-OH (right), C4-OH (right), C5-OH (right). D-glucose and D-mannose have these configurations and thus form the same osazone. D-Idose has a different configuration at C4 (OH on left), so it does not form this osazone. D-Fructose is a ketose and forms a different type of osazone, characterized by two consecutive imine groups, not a terminal aldehyde-derived imine group.