COMEDK2024ChemistryBiomoleculesActual
Which of the following statement is not true about glucose?
Options
- AGlucose on reaction with HI and red P at 373 ~K gives a mixture of cyclohexane and 1-iodohexane
- BGlucose reacts with hydroxylamine to form an oxime
- CGlucose does not give Schiff's reagent test
- DBoth -D-glucose and -D-glucose undergo mutarotation in aqueous solutions
Correct answer
A. Glucose on reaction with HI and red P at 373 ~K gives a mixture of cyclohexane and 1-iodohexane
Step-by-step solution
Glucose is an aldohexose with the structure CHO(CHOH)₄CH₂OH . Reaction with HI and red phosphorus at 373 K reduces glucose to n -hexane, not a mixture of cyclohexane and 1-iodohexane. This reaction confirms the presence of a straight chain of six carbon atoms in glucose. Glucose reacts with hydroxylamine ( NH₂OH ) to form an oxime, confirming the presence of a carbonyl group. Although glucose contains an aldehyde group, it does not give the Schiff's reagent test because the aldehyde group exists in a hemiacetal for