A) \[Bi{{H}_{3}}\]
B) \[Sb{{H}_{3}}\]
C) \[As{{H}_{3}}\]
D) \[P{{H}_{3}}\]
Correct Answer: A
Solution :
\[P{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}>Bi{{H}_{3}}\] On moving down the group bond energy decreases. Hence, stability decreases.
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