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a
PH3 > AsH3 > SbH3>NH3 >BiH3
b
BiH3> NH3 > SbH3 > AsH3 > PH3
c
PH3 > AsH3 >BiH3>NH3> SbH3
d
PH3 > AsH3>NH3> SbH3 >BiH3
answer is D.
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Detailed Solution
Down the group as the size of the molecule increases , Vanderwaals forces become strongerand BP increasesSo in 15th group the expected BP isNH3NH3< SbH3 AsH3>NH3> SbH3 >BiH3