Question

Observe the following structural formulae carefully and answer the questions.

(1) How many OH groups are present in glucose, fructose and ribose respectively? 

(2) Which other functional groups are present in these three compounds?

Answer 1

(1) Glucose contains five hydroxyl (- OH) groups. 

Fructose contains five hydroxyl (– OH) groups. 

Ribose contains four hydroxyl (– OH) groups. 

(2) Glucose contains aldehyde (– CHO) as other functional group.

Fructose contains ketonic group  as other functional group.

Ribose contains aldehyde (– CHO) as other functional group.