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JEE Main levelSingle correct optionDifficulty 2 of 3bm029

Which disaccharide consists of two alpha-D-glucose units joined by a C-1 to C-4 link and has a free hemiacetal group?

  1. Acellobiose
  2. Bsucrose
  3. Cmaltose
  4. Dlactose

Answer: C

Maltose has alpha-1,4 links between two glucose units and one free anomeric carbon, so it is reducing. Cellobiose has a beta link, lactose contains galactose, and sucrose has no free anomeric carbon.
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