Qstnid -I-7- Bond Angle In <Img Src="\etl\image\esa-cbse-xii\chem-hwh-sb1\c07/1_m51afeb08.gif" Width="32" Height="25">is Higher Than That In Ph<sub>3</sub>. Why? - 07: The P-block Elements

#7
Bond angle in is higher than that in PH₃. Why?
Ans : In PH₃, P is sp³ hybridized. Three orbitals are involved in bonding with three hydrogen atoms and the fourth one contains a lone pair. As lone pair-bond pair repulsion is stronger than bond pair-bond pair repulsion, the tetrahedral shape associated with sp³ bonding is changed to pyramidal. PH₃ combines with a proton to form in which the lone pair is absent. Due to the absence of lone pair in, there is no lone pair-bond pair repulsion. Hence, the bond angle in is higher than the bond angle in PH₃.