Arrange the Group 15 hydrides () in decreasing order of their boiling points. — p Block Elements Chemistry Question

💡 Solution & Explanation

Boiling point generally increases down the group due to increasing atomic size and stronger van der Waals forces. However, $NH_3$ has an anomalously high boiling point due to strong intermolecular hydrogen bonding. The correct descending order is $BiH_3 > SbH_3 > NH_3 > AsH_3 > PH_3$.