The correct match between Item I and Item II is:

Item I
(A) Ester test
(B) Carbylamine test
(C) Phthalein dye test

Item II
(P) Tyr
(Q) Asp
(R) Ser
(S) Lys

Question

The correct match between Item I and Item II is:

Item I
(A) Ester test
(B) Carbylamine test
(C) Phthalein dye test

Item II
(P) Tyr
(Q) Asp
(R) Ser
(S) Lys

Canvas Classes · Accepted Answer

Test–Amino acid matching:

Ester test: Detects –OH groups (alcohols) and –COOH groups (carboxylic acids) that can form esters.
- Asp (Aspartic acid): has –COOH side chain → ester test ✓
- Ser (Serine): has –CH₂OH side chain → ester test ✓
- Both Asp and Ser give positive ester test → (A) → (Q, R)

Carbylamine test: Detects primary amines (–NH₂). Gives foul-smelling isocyanide with CHCl₃/KOH.
- Lys (Lysine): has free ε-NH₂ group (primary amine) → positive carbylamine test ✓
- → (B) → (S)

Phthale

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