CBSE 2025, Set 3

Question

**Assertion (A):** The boiling points of alkyl halides decrease in the order RI > RBr > RCl > RF.

**Reason (R):** The van der Waals forces of attraction decrease in the order RI > RBr > RCl > RF. 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 and Reason (R) is the correct explanation of the Assertion (A).. **A is TRUE:** Boiling points of alkyl halides decrease in the order RI > RBr > RCl > RF. **R is TRUE:** Van der Waals forces (London dispersion forces) decrease in the order RI > RBr > RCl > RF because: - Iodine is the largest and most polarisable halogen → strongest induced dipole interactions - Fluorine is the smallest, least polarisable → weakest interactions **R correctly explains A:** Higher van der Waals forces → higher boiling point. Since RI has the strongest and RF the weakest van der Waals forces, boiling points follow the same order. **Answer: (A)**

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Chemistry > Organic Chemistry > Haloalkanes And Haloarenes

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