CBSE 2025, Set 1

Question

**Assertion (A):** The boiling point of ethanol is higher than that of methoxymethane.

**Reason (R):** There is intramolecular hydrogen bonding in ethanol. 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 Assertion (A) is true, but Reason (R) is false.. **A is TRUE:** Ethanol (b.p. 78°C) > methoxymethane (b.p. −24°C) because of **intermolecular** hydrogen bonding in ethanol. **R is FALSE:** Ethanol has **intermolecular** H-bonding (between different molecules), NOT intramolecular. Intramolecular H-bonding would actually lower the boiling point.

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Chemistry > Organic Chemistry > Alcohols Phenols And Ethers

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