A) \[N{{H}_{3}},\,\,P{{H}_{3}}\text{, }\,As{{H}_{3}}\]
B) \[As{{H}_{3}},\,P{{H}_{3}}\text{, }N{{H}_{3}}\]
C) \[N{{H}_{3}}\text{, }As{{H}_{3}}\text{, }P{{H}_{3}}\]
D) \[P{{H}_{3}},As{{H}_{3}}\text{, }N{{H}_{3}}\]
Correct Answer: D
Solution :
[d] \[P{{H}_{3}},As{{H}_{3}},N{{H}_{3}}\] \[P{{H}_{3}}<As{{H}_{3}}<N{{H}_{3}}\] Enthalpy of vaporization. Higher the boiling point higher will be the enthalpy of vaporization. Boiling point of \[N{{H}_{3}}\] is higher than those of \[P{{H}_{3}}\] and \[As{{H}_{3}}\] but lower than \[Sb{{H}_{3}}\]due to the reason that the increase in vander waal forces of attraction.
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