Relatively low boiling points for PH₃, AsH₃ and SbH₃ can be attributed to: A) low molecular weight B) very weak or non-existent hydrogen bonding C) low vapour pressure at standard conditions.

Question

Quizplus · Accepted Answer

The relatively low boiling points of PH3, AsH3, and SbH3 compared to their group counterparts can be attributed to very weak or non-existent hydrogen bonding. These molecules do not exhibit significant hydrogen bonding because the hydrogen is bonded to elements (P, As, Sb) that are not highly electronegative, unlike the case with water (H2O), where hydrogen bonding is strong due to the high electronegativity of oxygen.

Relatively Low Boiling Points for PH3, AsH3 and SbH3 Can

Relatively Low Boiling Points for PH₃, AsH₃ and SbH₃ Can