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Statement-I : Solubility on n-alcohols i...

Statement-I : Solubility on n-alcohols in water decreases with increase in molecular weight
Because
Statement-II: The relative proportion of the hydrocarbon part in alcohols increases with increasing molecular weight which permits enhanced hydrogen bond with water.

A

If both the assertion and reason are true statement and reason is correct explanation of the assertion .

B

If both the assertion and reason are true statement but reason is not a correct explanation of the assertion .

C

If the assertion is true but the reason is a false statement.

D

If both assertion and reason are false statements.

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the statements provided in the question, we will break down the reasoning behind each statement step by step. ### Step-by-Step Solution: 1. **Understanding Statement-I**: - Statement-I claims that the solubility of n-alcohols in water decreases with an increase in molecular weight. - This is generally true because as the molecular weight of alcohols increases, the hydrophobic (non-polar) hydrocarbon part of the molecule becomes larger compared to the hydrophilic (polar) hydroxyl group (-OH). 2. **Understanding Statement-II**: - Statement-II suggests that the relative proportion of the hydrocarbon part in alcohols increases with increasing molecular weight, which permits enhanced hydrogen bonding with water. - This statement is misleading. While it is true that the hydrocarbon part increases with molecular weight, this does not enhance hydrogen bonding. In fact, a larger hydrocarbon part reduces the overall ability of the alcohol to interact with water through hydrogen bonding. 3. **Analyzing the Relationship**: - The assertion (Statement-I) is correct: as the molecular weight of alcohols increases, their solubility in water decreases. - The reason (Statement-II) is incorrect: an increase in the hydrocarbon part does not enhance hydrogen bonding; instead, it decreases the effectiveness of hydrogen bonding due to the larger hydrophobic component. 4. **Conclusion**: - Therefore, we conclude that Statement-I is true and Statement-II is false. ### Final Answer: The correct answer is C: Assertion is true, but the reason is false. ---
To analyze the statements provided in the question, we will break down the reasoning behind each statement step by step. ### Step-by-Step Solution: 1. **Understanding Statement-I**: - Statement-I claims that the solubility of n-alcohols in water decreases with an increase in molecular weight. - This is generally true because as the molecular weight of alcohols increases, the hydrophobic (non-polar) hydrocarbon part of the molecule becomes larger compared to the hydrophilic (polar) hydroxyl group (-OH). ...
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