Assertion (A): The boiling points of alkyl ...

CBSE Class 12 Chemistry 2025 All Sets Solved Paper

Question : 15 of 16

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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.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
Assertion (A) is true, but Reason (R) is false.
Assertion (A) is false, but Reason (R) is true.

Solution:

RI > RBr > RCl >RF

Order in boiling point is due to decreasing size and mass of halogen atom, the magnitude of Vander wall forces decreases.

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