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JEE Main 2025 Jan 24 Shift 2, Chemistry Q19: Nucleic Acids

JEE Main2025Jan 24, Shift 2Chemistry
Q.

Match List-I with List-II.

Choose the correct answer from the options given below :

  1. A

    (A)-(III), (B)-(IV), (C)-(II), (D)-(I)

  2. B

    (A)-(III), (B)-(I), (C)-(IV), (D)-(II)

  3. C

    (A)-(IV), (B)-(III), (C)-(II), (D)-(I)

  4. D

    (A)-(III), (B)-(IV), (C)-(I), (D)-(II)

Solution

Identify each base by skeleton and substituents:

  • Adenine is the only purine in the list (fused imidazole + pyrimidine ring) bearing an at C6 structure (III).
  • Cytosine is a pyrimidine with an at C4 and a at C2 structure (IV).
  • Thymine is 5-methyluracil: a pyrimidine-2,4-dione carrying a at C5 structure (II).
  • Uracil is the unmethylated pyrimidine-2,4-dione structure (I).

Match: A-III, B-IV, C-II, D-I.

Correct option: (1)

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