Which one has the lowest boiling point?\

Question

Professor PC Thomas Classes · Answer

(b) : Boiling point of hydrides increases with increase in atomic number but ammonia has exceptionally high boiling point due to hydrogen bonding. Thus, the correct order of boiling point is, $$ \mathrm{BiH}_{3}>\mathrm{SbH}_{3}>\mathrm{NH}_{3}>\mathrm{AsH}_{3}>\mathrm{PH}_{3} $$