Question

Which of the following has the highest boiling point?

$H_{2}O,H_{2}S,H_{2}Se$ and $H_{2}Te$

• A. $H_{2}O$ because of hydrogen bonding
• B. $H_{2}Te$ because of higher molecular weight
• C. $H_{2}S$ because of hydrogen bonding
• D. $H_{2}Se$ because of lower molecular weight

Answer 1

The correct option is A $H_{2}O$ because of hydrogen bonding

In hydrides of group 16, boiling point increases down the group because of increasing molecular mass. But water has an exceptionally high boiling point because it shows intermolecular hydrogen bonding.