CBSE 2025, Set 1

Question

**Assertion (A):** The boiling points of alkyl halides decrease in the order: RI > RBr > RCl > RF.

**Reason (R):** The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass. 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:** RI > RBr > RCl > RF — boiling point increases with molecular mass and polarisability (stronger London forces). **R is TRUE:** Alkyl halides (except RF) have higher boiling points than comparable hydrocarbons. **R does not explain A** — A concerns the relative order among halides; R concerns comparison with hydrocarbons. Both true, but R is not the correct explanation.

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Chemistry > Organic Chemistry > Haloalkanes And Haloarenes

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