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'a' and 'b' are van der Waals' constants for gases. Chlorine is more easily liquefied than ethane because

1. a and b for Cl2 < a for C2H6 but b for Cl2 < b for C2H6
2. a for Cl2 < a for C2H6 but b for Cl2 > b for C2H6
3. a for Cl2 > a for C2H6 but b for Cl2 < b for C2H6
4. a and b for Cl2 > a and b for C2H6

Correct answer: a for Cl2 > a for C2H6 but b for Cl2 < b for C2H6

Solution

Chlorine has a higher 'a' constant, indicating stronger intermolecular attractions compared to ethane, which facilitates its liquefaction. Meanwhile, a lower 'b' constant for chlorine suggests it occupies less volume per mole, further aiding in its ability to be liquefied.

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