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Carbohydrates are large molecules with the molecular form...

Carbohydrates are large molecules with the molecular formula C $_x$ (H $_2$ O) $_y$ . 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.

galactose and starch

View answer & explanation

Correct answer is B

Glucose = C $_6$ (H $_2$ O) $_6$

= C $_6$ H $_{12}$ O $_6$

Maltose = C $_{12}$ (H $_2$ O) $_{11}$

= C $_{12}$ H $_{22}$ O $_{11}$

Starch = C $_6$ (H $_2$ O) $_5$

= C $_6$ H $_{10}$ O $_5$

Sucrose = C $_{12}$ (H $_2$ O) $_{11}$

= C $_{12}$ H $_{22}$ O $_{11}$

Fructose = C $_6$ (H $_2$ O) $_6$

= C $_6$ H $_{12}$ O $_6$

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