Which one of the following is correct structure for cytosine?
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The Correct Option is C
Solution and Explanation
Option (1) is a 6-methylpyrimidin-2-one (no amino group), option (2) is thymine (5-methyluracil, two C=O), option (4) has the amino group at C-5 instead of C-4.
Option (3) matches cytosine.
Answer: (3) the structure with \(\mathrm{NH_2}\) at C-4, C=O at C-2 and N-H at N-1
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