The peptide that gives positive ceric ammonium nitrate and carbylamine tests is:

Question

Canvas Classes · Accepted Answer

Test requirements:

Ceric ammonium nitrate (CAN) test: Positive for compounds with –OH group (alcohols, phenols). Gives red/orange colour.

Carbylamine test: Positive for primary amines (–NH₂ group). Gives foul-smelling isocyanide with CHCl₃/KOH.

Analysis of each peptide:

| Peptide | –OH group? | Primary –NH₂ (free)? | CAN | Carbylamine |
|---|---|---|---|---|
| Gln–Asp | No –OH side chain | No free primary amine (N-terminus blocked by Gln amide) | − | − |
| Asp–Gln | No –OH side chain | N-ter

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