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Chemistry · 2025 · 1 mark
Haloalkanes and HaloarenesPhysical Properties of Haloalkanes and Haloarenes1 markUnderstandassertion reason
CBSE 2025 · Region 1 · Set 1 · Q14
Assertion (A): The boiling points of alkyl halides decrease in the order: RI > RBr > RCl > RF. Reason (R): The boiling points of alkyl chlorides,…
Assertion (A) : The boiling points of alkyl halides decrease in the order : $\displaystyle \mathrm{RI}>\mathrm{RBr}>\mathrm{RCl}>\mathrm{RF}$.
Reason (R) : The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass.
Official answer
(B)
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.