GKFix MCQ Question

Arrange the group 15 hydrides NH₃, PH₃, AsH₃, SbH₃, BiH₃ in order of increasing base strength.

• A. NH₃ < PH₃ < AsH₃ < SbH₃ < BiH₃
• B. PH₃ < NH₃ < AsH₃ < SbH₃ < BiH₃
• C. BiH₃ < SbH₃ < AsH₃ < PH₃ < NH₃
• D. AsH₃ < PH₃ < NH₃ < SbH₃ < BiH₃