Out of following isomeric forms of uracil, which one is present in RNA?
Biomolecules · Class 12 · JEE Main Previous Year Question
Out of following isomeric forms of uracil, which one is present in RNA?
- a
Option a
- b
Option b
- c✓
Option c
- d
Option d
Option c
Step 1: Uracil Tautomerism — Like all nitrogenous bases, Uracil exists in tautomeric forms (amide/enol).
Step 2: Most Stable Form — In physiological conditions (pH 7), the diketoform is the dominant and most stable isomer.
Step 3: Identification — This structure involves two carbonyl groups at the C2 and C4 positions. Correct option is (c).
Key Point: The keto form correctly positions the hydrogen-bond donors and acceptors for base-pairing.
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