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

Options

A. a' for `Cl_(2) gt 'a' " for " C_(2)H_(6)` but 'b' for `Cl_(2) lt 'b'` for `C_(2)H_(6)`
B. a' and 'b' for `Cl_(2) gt 'a'` and 'b' for `C_(2)H_(6)`
C. a' and 'b' for `Cl_(2) lt 'a'` and 'b' for `C_(2)H_(6)`
D. a' for `Cl_(2) lt 'a'` for `C_(2)H_(6)` but 'b' for `Cl_(2) gt 'b'`

Answer

A

Explanation

a' for `Cl_(2)` will be greater than that of `C_(2)H_(6)` because intermolecular force among the molecules of `Cl_(2)` are stronger. Molecular size of `C_(2)H_(6)` is greater than that of `Cl_(2)` hence the value of 'b' is also greater for `C_(2)H_(6)`