A) \[N{{H}_{3}}>P{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}\]
B) \[Sb{{H}_{3}}>N{{H}_{3}}>As{{H}_{3}}>P{{H}_{3}}\]
C) \[Sb{{H}_{3}}>As{{H}_{3}}>N{{H}_{3}}>P{{H}_{3}}\]
D) \[N{{H}_{3}}>As{{H}_{3}}>P{{H}_{3}}>Sb{{H}_{3}}\]
Correct Answer: B
Solution :
Compound \[N{{H}_{3}}\,\,\,P{{H}_{3}}\,\,As{{H}_{3}}\,\,Sb{{H}_{3}}\] Boiling point (K) 238 185 211 254 (i) Boiling point of \[N{{H}_{3}}\] is high due to intermolecular hydrogen bonding. (ii) The boiling point among hydrides increases while moving down group, due to increase in size. \[\therefore \] The boiling points are in the following order \[Sb{{H}_{3}}>N{{H}_{3}}>As{{H}_{3}}>P{{H}_{3}}\]
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