Question:
Thymine is carrying methyl group at carbon number
Thymine is carrying methyl group at carbon number
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Thymine = 5-methyluracil (methyl group is attached at carbon C5 of the pyrimidine ring).
Updated On: Sep 15, 2026
- C2
- C3
- C4
- C5
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Pyrimidines (cytosine, uracil, thymine) possess a six-membered heterocyclic aromatic ring numbered from N1 to C6.
Step 2: Detailed Explanation:
Thymine (5-methyluracil) is structurally a pyrimidine base chemically designated as 5-methylpyrimidine-2,4-dione.
It carries a methyl ($-\text{CH}_3$) substituent group attached covalently at the carbon-5 (C5) position of the pyrimidine ring.
(In RNA, uracil lacks this C5 methyl group).
Step 3: Final Answer:
Therefore, thymine carries a methyl group at carbon number C5.
Pyrimidines (cytosine, uracil, thymine) possess a six-membered heterocyclic aromatic ring numbered from N1 to C6.
Step 2: Detailed Explanation:
Thymine (5-methyluracil) is structurally a pyrimidine base chemically designated as 5-methylpyrimidine-2,4-dione.
It carries a methyl ($-\text{CH}_3$) substituent group attached covalently at the carbon-5 (C5) position of the pyrimidine ring.
(In RNA, uracil lacks this C5 methyl group).
Step 3: Final Answer:
Therefore, thymine carries a methyl group at carbon number C5.
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