CBSE 2025, Set 3

Question

**Assertion (A):** The solubility of aldehydes and ketones in water decreases with increase in size of the alkyl group.

**Reason (R):** Aldehydes and ketones have dipole-dipole interaction. A). Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). B). Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). C). Assertion (A) is true, but Reason (R) is false. D). Assertion (A) is false, but Reason (R) is true.

Edvaya · Accepted Answer

The correct answer is Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).. **A is TRUE:** Solubility of aldehydes/ketones in water decreases as alkyl group size increases because larger alkyl groups increase the hydrophobic (non-polar) character, reducing the ability to form hydrogen bonds with water. **R is TRUE:** Aldehydes and ketones do have dipole–dipole interactions (due to polar C=O group), which contribute to their solubility in polar solvents. **R does NOT explain A:** The reason for decreasing solubility with alkyl size is the **increasing hydrophobic/non-polar character** of the molecule, not the presence of dipole–dipole interactions. R explains why they are soluble at all, not why solubility decreases. **Answer: (B)**

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Chemistry > Organic Chemistry > Aldehydes Ketones And Carboxylic Acids

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