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Of the four original solutions studied, which of the following pairs of solutions contain epimers?Maltose and lactoseGalactose and glucoseMaltose and glucoseLactose and galactoseA.I onlyB.II onlyC.I and III onlyD.II and IV only

Question

Of the four original solutions studied, which of the following pairs of solutions contain epimers?Maltose and lactoseGalactose and glucoseMaltose and glucoseLactose and galactoseA.I onlyB.II onlyC.I and III onlyD.II and IV only

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Solution

Epimers are diastereomers that differ in configuration at only one stereogenic center.

  1. Maltose and lactose: Maltose is a disaccharide formed from two units of glucose joined with an α(1→4) bond. Lactose is a disaccharide formed by the condensation of galactose and glucose. They are not epimers because they do not have the same molecular formula and do not differ at only one stereogenic center.

  2. Galactose and glucose: These are epimers. They have the same molecular formula and differ only at the C4 position.

  3. Maltose and glucose: Maltose is a disaccharide formed from two units of glucose. They are not epimers because they do not have the same molecular formula.

  4. Lactose and galactose: Lactose is a disaccharide formed by the condensation of galactose and glucose. They are not epimers because they do not have the same molecular formula.

So, the pair that contains epimers is Galactose and Glucose. Therefore, the answer is B. II only.

This problem has been solved

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