Identify a hydride with highest boiling point from following?

The hydrides of Group 16 elements are $\text{H}_2\text{O}$, $\text{H}_2\text{S}$, $\text{H}_2\text{Se}$, and $\text{H}_2\text{Te}$.

Generally, the boiling point of hydrides increases down the group due to an increase in molecular mass and van der Waals forces. However, $\text{H}_2\text{O}$ has an exceptionally high boiling point due to the presence of strong intermolecular hydrogen bonding, which is absent in the other hydrides.

The order of boiling points is $\text{H}_2\text{S} < \text{H}_2\text{Se} < \text{H}_2\text{Te} < \text{H}_2\text{O}$.

Thus, $\text{H}_2\text{O}$ has the highest boiling point.

Answer: $\text{H}_2\text{O}$