NEET 2018 · BiologyCarbohydratesPrevious Year Question
The two functional groups characteristic of sugars are
Answer: (D) Carbonyl and hydroxyl. Answer: (D) Carbonyl and hydroxyl.
- A.Carbonyl and phosphate
- B.Carbonyl and methyl
- C.Hydroxyl and methyl
- D.Carbonyl and hydroxyl✓
Correct Answer
(D) Carbonyl and hydroxyl
Solution & Explanation
Answer: (D) Carbonyl and hydroxyl. Solution: Sugars are polyhydroxy aldehydes or polyhydroxy ketones, so each sugar carries a carbonyl group (the aldehyde/ketone C=O) together with multiple hydroxyl (–OH) groups. Phosphate and methyl groups are not characteristic functional groups of sugars, so only carbonyl + hydroxyl is correct. NCERT Reference: Ch 9, p.105, line ~97 — "nucleotide bases, fatty acids etc."
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