The hydrides of group 5a are nh3, ph3, ash3, and sbh3. arrange them from highest to lowest boiling point.

Explanation:

Hello,

On the attached picture you will find a graph showing off the boiling point of the involved hydrides. In order to explain the exhibited behavior one must take into account that the higher the period of the group VA element's hydride, the higher the boiling point, nonetheless, ammonia shows an unexpected high boiling point which is possible due to the fact that nitrogen contains a small atomic number which is strongly electronegative with lone pairs, and which are strongly bonded to the hydrogen atoms. In spite of this, the tendency is conserved for phosphorous, arsenic and antimony  since typical intermolecular interactions increase with increasing atomic number of the central atom in the molecule.

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the answer is 0.42 is that is an option. this question provides no info