A) \[N{{H}_{3}}>P{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}\]
B) \[N{{N}_{3}}<P{{H}_{3}}<Sb{{H}_{3}}<As{{H}_{3}}\]
C) \[P{{H}_{3}}>N{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}\]
D) \[As{{H}_{3}}>N{{H}_{3}}>P{{H}_{3}}>Sb{{H}_{3}}\]
Correct Answer: A
Solution :
As the size of fifth group elements increases, \[AH\](where, A = element of Vth A group) bond length increases. Thus, the\[AH\]bond becomes weak and less energy is required to dissociate it. Thus, on moving downwards, the stability of Vth A group elements hydrides decreases. The order of their stability is \[N{{H}_{3}}>P{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}\]
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