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  4. In the reaction, PH3 + HI arrow PH4I, PH3 is behaving like

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Q. In the reaction, $PH_3 + HI \rightarrow PH_4I, PH_3$ is behaving like

JIPMERJIPMER 2016The p-Block Elements - Part2

Solution:

Phosphine $(PH_3)$ is feebly basic and forms salts with mineral acids under anhydrous conditions.
$\underset{\text{Phosphine}}{PH_3} + HX \rightarrow \underset{\text{Phosphonium halide } (X=Cl,Br,I)}{PH^+_4 X^-}$