Carbohydrates are large molecules with the molecular formula Cx(H2O)y. In which of the following pairs is x not equal to y?

A. glucose and starch
B. maltose and starch
C. sucrose and fructose
D. maltose and starch

Correct Answer:

Option B – maltose and starch

Explanation

Glucose = C6(H2O)6

= C6H12O6

Maltose = C12(H2O)11

= C12H22O11

Starch = C6(H2O)5

= C6H10O5

Sucrose = C12(H2O)11

= C12H22O11

Fructose = C6(H2O)6

= C6H12O6