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Glucose Or Sucrose Are Soluble in Water but Cyclohexane Or Benzene (Simple Six Membered Ring Compounds) Are Insoluble in Water. Explain. - CBSE (Science) Class 12 - Chemistry

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Question

Glucose or sucrose are soluble in water but cyclohexane or benzene (simple six membered ring compounds) are insoluble in water. Explain.

Solution 1

A glucose molecule contains five −OH groups while a sucrose molecule contains eight −OH groups. Thus, glucose and sucrose undergo extensive H-bonding with water.

Hence, these are soluble in water.

But cyclohexane and benzene do not contain −OH groups. Hence, they cannot undergo H-bonding with water and as a result, are insoluble in water.

Solution 2

The .solubility of a solute in a given solvent follows the rule ‘ Like dissolves like’.Glucose contains five and sucrose contains eight -OH groups. These -OH groups form H-bonds with water. As a result of this extensive intermoleeular H-bonding, glucose and sucrose are soluble in water.On the other hand, benzene and cyclohexane do not contain -OH bonds and hence do not form H-bonds with water. Moreover, they are non-polar molecules and hence do not dissolve in polar water molecules.

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Solution Glucose Or Sucrose Are Soluble in Water but Cyclohexane Or Benzene (Simple Six Membered Ring Compounds) Are Insoluble in Water. Explain. Concept: Classification of Carbohydrates.
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