COMEDK · Chemistry · 30. Biomolecules

Glucose contains in addition to aldehyde group

A one secondary \(\mathrm{OH}\) and four primary \(\mathrm{OH}\) groups
B one primary \(\mathrm{OH}\) and four secondary \(\mathrm{OH}\) groups
C two primary \(\mathrm{OH}\) and three secondary \(\mathrm{OH}\) groups
D three primary \(\mathrm{OH}\) and two secondary \(\mathrm{OH}\) groups

Verified Solution

Answer & Solution

Correct Answer

(B) one primary \(\mathrm{OH}\) and four secondary \(\mathrm{OH}\) groups

Step-by-step Solution

Detailed explanation

Glucose contains in addition to aldehyde group on primary \(\mathrm{OH}\) and four secondary \(\mathrm{OH}\) groups. The structure of glucose is

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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