Question

Assertion (A): n-Butyl chloride has higher boiling point than n-Butyl bromide.
Reason (R): C—Cl bond is more polar than C—Br bond.

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

Hint:

When comparing boiling points, focus on intermolecular forces. Halides with larger atoms (like Br) usually have higher boiling points due to stronger Van der Waals forces.

Answer 1

The Correct Option is D

The boiling point of n-Butyl chloride is actually lower than n-Butyl bromide due to the larger size and weaker Van der Waals forces in n-Butyl bromide, even though the C—Cl bond is more polar than the C—Br bond. Hence, the assertion is false, but the reason is true.