Which is in the decreasing order of boiling points of Vth group hydrides?
A
NH3>PH3>AsH3>SbH3
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B
SbH3>AsH3>PH3>NH3
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C
PH3>NH3>AsH3>SbH3
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D
SbH3>NH3>AsH3>PH3
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Solution
The correct option is CSbH3>NH3>AsH3>PH3 NH3 will have the higher boiling point because NH3 molecules can form hydrogen bonds with each other. The other molecules will increase in boiling point with size. So, in order of decreasing boiling point: SbH3>NH3>AsH3>PH3