COMEDK · Chemistry · 30. Biomolecules

Which of the following statement is not true about glucose?

A Glucose on reaction with \(\mathrm{HI}\) and red \(\mathrm{P}\) at \(373 \mathrm{~K}\) gives a mixture of cyclohexane and 1-iodohexane
B Glucose reacts with hydroxylamine to form an oxime
C Glucose does not give Schiff's reagent test
D Both \(\alpha\)-D-glucose and \(\beta\)-D-glucose undergo mutarotation in aqueous solutions

Verified Solution

Answer & Solution

Correct Answer

(A) Glucose on reaction with \(\mathrm{HI}\) and red \(\mathrm{P}\) at \(373 \mathrm{~K}\) gives a mixture of cyclohexane and 1-iodohexane

Step-by-step Solution

Detailed explanation

Glucose is an aldohexose with the structure \(CHO(CHOH)_{4}CH_{2}OH\). Reaction with \(HI\) and red phosphorus at \(373 \text{ K}\) reduces glucose to \(n\)-hexane, not a mixture of cyclohexane and 1-iodohexane. This reaction confirms the presence of a straight chain of six…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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