Lower aliphatic amines are soluble in water because they can form hydrogen bonds with water.Statement-II : Higher aliphatic amines are essentially insoluble in water, due to increase in size of hydrophilic alkyl group.A Statement-I and II both are correct. B Statement-I is incorrect but statement-II is correct. C Statement-I is correct but statement-II is false. D Both statement-I and II are incorrect.
Question
Lower aliphatic amines are soluble in water because they can form hydrogen bonds with water.Statement-II : Higher aliphatic amines are essentially insoluble in water, due to increase in size of hydrophilic alkyl group.A Statement-I and II both are correct. B Statement-I is incorrect but statement-II is correct. C Statement-I is correct but statement-II is false. D Both statement-I and II are incorrect.
Solution
Statement-I: Lower aliphatic amines are soluble in water because they can form hydrogen bonds with water.
Explanation:
- Lower aliphatic amines refer to amines with smaller alkyl groups attached to the nitrogen atom.
- These amines have the ability to form hydrogen bonds with water molecules.
- Hydrogen bonding occurs between the lone pair of electrons on the nitrogen atom of the amine and the hydrogen atoms of water molecules.
- This interaction between the amine and water molecules allows for solubility in water.
Statement-II: Higher aliphatic amines are essentially insoluble in water, due to an increase in the size of the hydrophilic alkyl group.
Explanation:
- Higher aliphatic amines refer to amines with larger alkyl groups attached to the nitrogen atom.
- As the size of the alkyl group increases, the hydrophobic nature of the amine also increases.
- The hydrophilic alkyl group refers to the part of the amine molecule that has an affinity for water.
- With larger alkyl groups, the hydrophilic part becomes less significant compared to the hydrophobic part.
- As a result, the solubility of higher aliphatic amines in water decreases, making them essentially insoluble.
Based on the explanations provided, the correct answer is: C) Statement-I is correct but statement-II is false.
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