Question

Which of the following has the highest boiling point and why?
$H_{2}O,H_{2}S,H_{2}Se\text{and}{H}_{2}Te$

• 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. $H_{2}S$ because of lower molecular weight

Answer 1

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

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