Question

How many products are produced respectively when optically pure glucose and fructose are reduced one by one by $NaB{H}_4$?

• A. 1 & 1
• B. 2 & 2
• C. 1 & 2
• D. 2 & 1

Answer 1

The correct option is C 1 & 2

$\bullet$ ${NaBH}_4$ reduces aldehyde group of glucose into alcohol and form only one product.

$\bullet$ ${NaBH}_4$ reduces keto group of fructose into alcohol, but forms two product, as-

$-{NaBH}_4$ can attack keto group from both side and form D-mannitol and D-sorbital.