The p-Block Elements — Chemistry STD 12 Science — Question
Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe p-Block Elements1 Mark
Question
Why does $NH_3$ form hydrogen bond but $PH_3$ does not?
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Answer
Formation of hydrogen bonding depend on the size of molecule. smaller the size greater the hydrogen bonding. Nitrogen has smaller size than phosphrous thus having a more abilty to form hydrogen bond.
N—H bond is reasonably polar and this leads to hydrogen bonding. As the bond polarity of the P—H bond is almost negligible, $PH_3$ is not involved in hydrogen bonding.
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