The peptide that gives positive ceric ammonium nitrate and carbylamine test is:
Biomolecules · Class 12 · JEE Main Previous Year Question
The peptide that gives positive ceric ammonium nitrate and carbylamine test is:
- a
Lys-Asp
- b✓
Ser-Lys
- c
Gln-Asp
- d
Asp-Gln
Ser-Lys
Step 1: Specificity of Tests — Ceric ammonium nitrate is a test for primary and secondary alcohols (producing a red color change).
Step 2: Carbylamine Test Purpose — The is specific for primary amines. In a peptide, the terminal amino group and side-chain amino groups are potential sites.
Step 3: Identifying the Peptide — Ser-Lys (Serine-Lysine) features an alcohol group on serine and a primary amino group (both terminal and side-chain). Correct option is (b).
Key Point: Lysine-Aspartate lacks the alcohol group, and Glutamine derivatives involve amides which do not react positively in these tests.
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