Question

Which of the following would you expect to have the lowest boiling point?

• A. $H_{2}O$
• B. $N{H}_3$
• C. $C{H}_4$
• D. $H_2$

Answer 1

The correct option is D $H_2$

The boiling point of a substance depends on strength of intermolecular forces. The higher the intermolecular forces, the higher the boiling point. Here $H_{2}O,N{H}_3$ has hydrogen bonding, and $C{H}_4$ has Vanderwall forces. So, $H_2$ which has the least intermolecular forces has a low boiling point.

So, the order is $H_{2}O>N{H}_3>C{H}_4>H_2$