JAMB Chemistry 2012 Objective — Question 43

Question 43 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2012 Objective paper, with the correct answer and a full explanation.

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 fructose
C. Sucrose and fructoseCorrect
D. Maltose and starch

Explanation

Glucose C6H12O6=C6(H2O)6 (x=y=6). Fructose is also C6H12O6 (x=y=6). Sucrose C12H22O11=C12(H2O)11 (x=12,y=11, x≠y). Thus for the sucrose/fructose pair, x is not equal to y for sucrose (unlike fructose, where x=y).

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