Question

Arrange the following carbohydrates in the increasing order of number of monosaccharide units formed on hydrolysis.

(a) Raffinose
(b) Fructose
(c) Maltose
(d) Stachyose

• A. c b a d
• B. b c a d
• C. d a c b
• D. b a c d

Answer 1

The correct option is B b c a d

(i) Fructose is a simple ketonic monosaccharide.
(ii) Maltose is composed of two glucose units, hence it is a disaccharide.
(iii) Raffinose is a trisaccharide composed of galactose, glucose, and fructose.
(iv) Stachyose is a tetrasaccharide consisting of two -D-galactose units, one -D-glucose unit, and one -D-fructose unit.