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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