JEE Advanced Chemistry question

Statement 1: The van der Waals' forces are directly proportional to the ionisation potentials Statement 2: Van der Waals' forces increases as the size and diffuseness of the electron clouds increases

(A)Assertion is True, Reason is True; Reason is correct explanation for Assertion
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is TrueCorrect

Answer: (D)

Solution

Van der Waals (London dispersion) forces are actually *inversely* related to ionisation potential — atoms/molecules with a low ionisation potential have a more easily polarisable (loosely held) electron cloud, which produces stronger instantaneous dipoles and hence stronger dispersion forces, so

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Question ID VK-159294