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Order of basicity: NH₃, PH₃, AsH₃, SbH₃:

ANH₃ > PH₃ > AsH₃ > SbH₃
BSbH₃ > AsH₃ > PH₃ > NH₃
CRandom
DSame
Answer & Solution
Correct answer: A. NH₃ > PH₃ > AsH₃ > SbH₃
**Basicity decreases down group 15:** NH₃ > PH₃ > AsH₃ > SbH₃. Lone pair on smaller atom (N) is more available larger atoms have lone pair in more diffuse orbital (poor overlap with proton).
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