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JEE Main levelSingle correct optionDifficulty 2 of 3bm244

The glycoside shown has a ring made of how many atoms, and is it a reducing sugar derivative?

  1. ASix (pyranose); non-reducing
  2. BFive (furanose); reducing
  3. CFive (furanose); non-reducing
  4. DSix (pyranose); reducing

Answer: C

Counting the ring atoms gives four carbons and one oxygen, a five-membered furanose ring. The anomeric carbon bears the OCH3 group, so it is an acetal (methyl beta-D-ribofuranoside) and there is no free hemiacetal OH; it is non-reducing.
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