Which among the following has the highest boiling point?

(i) hydrogen (ii) helium (iii) neon (iv) xenon (v) methane

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Solution

Greater the intermolecular forces between molecules greater the boiling point of substance. The order of intermolecular force is as follows.

$I o n i c > H - b o n d > V a n d e r w a a l > d i s p e r s i o n f o r c e s .$

The intermolecular force between the two noble gas atoms is dispersion force while in $C H_{4}$ it is van der Waal forces.
$H_{2}$ has very low molecular weight and they exhibit very weakly van der wall force between two $H_{2}$ molecules. $H e, N e,$ and $X e$ are noble gases. So, they have a lower boiling point than that of methane.

Hence, $C H_{4}$ has the highest boiling point.

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