question_answer 2)

Would you expect the hydrides of N, O and F to have lower boiling points than the hydrides of their subsequent group members? Give reason.

Answer:

On the basis of molecular masses of \[N{{H}_{3}},{{H}_{2}}O\]and HP, boiling point of these hydrides is expected to be lower than the hydrides of subsequent group members. However, due to high electro negativity of nitrogen, oxygen and fluorine, their hydrides form strong intermolecular hydrogen bond and hence they have boiling point higher than the hydrides of subsequent group members.