A) \[As{{H}_{3}}\]
B) \[Sb{{H}_{3}}\]
C) \[N{{H}_{3}}\]
D) \[P{{H}_{3}}\]
Correct Answer: B
Solution :
\[\xrightarrow{N{{H}_{3}}\,\,>\,\,\,P{{H}_{3}}\,\,\,>As{{H}_{3}}\,\,>\,\,Sb{{H}_{3}}\,>\,\,\,Bi{{H}_{3}}_{{}}}\] Stability decreases down the group because bond energy decreases down the group.
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