Answer: Carbonyl group.
- A Hydroxyl group
- B Carbonyl group
- C Carboxyl group
- D Amino group
Correct answer: B. Carbonyl group
Explanation: Oxime formation with hydroxylamine is characteristic of a carbonyl group; in open-chain glucose this is the aldehyde (>C=O) at C-1.
Two amino acids join via a condensation reaction: the carboxyl -OH of one and an amine -H of the other are eliminated as water, leaving a peptide bond (-CO-NH-) linking them into a dipeptide; repeating this builds a full protein chain.
Concept context
The chemistry of life: carbohydrates, proteins, lipids, nucleic acids, enzymes, and vitamins. Understand their structures, classification, and biological functions. Highly relevant for NEET and Class 12 board exams.