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JEE Main levelSingle correct optionDifficulty 2 of 3bm268

In the nucleoside shown, which atom of the base forms the N-glycosidic bond to C-1' of the sugar?

  1. AN-3 of the pyrimidine ring
  2. BN-9 of the purine ring
  3. CN-1 of the pyrimidine ring
  4. DThe exocyclic amino nitrogen

Answer: C

Pyrimidine nucleosides bond through N-1 of the base to C-1' of the sugar, while purines use N-9. The base here is cytosine (a pyrimidine), so the linkage is through N-1; the exocyclic NH2 and N-3 are not involved. The nucleoside is 2-deoxycytidine.
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