question_answer 47)

  Which of the following reactions of glucose can be explained only by its cyclic structure ? (a)Glucose forms pent acetate (b)Glucose reacts with hydroxylamine to form an oxime (c)Pentaacetate of glucose does not react with hydroxylamine (d)Glucose is oxidised by nitric acid to gluconic acid

Answer:

  (C) Due to absence of free OH group at , cyclic structure of glucose pentacetate cannot revert to open chain aldehydic form and hence cannot form an oxime.