The correct order of boiling points of hydrides of $15^{\text {th }}$ group elements is

1. $\mathrm{PH}_3 < \mathrm{AsH}_3 < \mathrm{NH}_3 < \mathrm{SbH}_3 < \mathrm{BiH}_3$
2. $\mathrm{PH}_3 < \mathrm{AsH}_3 < \mathrm{SbH}_3 < \mathrm{NH}_3 < \mathrm{BiH}_3$
3. $\mathrm{PH}_3 < \mathrm{AsH}_3 < \mathrm{SbH}_3 < \mathrm{BiH}_3 < \mathrm{NH}_3$
4. $\mathrm{BiH}_3 < \mathrm{SbH}_3 < \mathrm{AsH}_3 < \mathrm{PH}_3 < \mathrm{NH}_3$

Solution

Asked in: AP EAMCET 2017 (24 Apr Shift 1)

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