Question

In how many of the following compounds hybridization is not possible?
1) PC13
2) PH3
3) AsH3
4) H25
5) H2Se
6) PF3
7) N(SİH3)3
8) [XeF]

Answer 1

H25 is many of compounds hybridization because the compound will be high of getting so

Answer 2

(Here, it must be $\[PC{l_3}\]$, $\[{H_2}S\]$ and $\[Xe{F_2}\]$ instead of PC13, H25 and [XeF].)

Among the following compounds, hybridisation is not possible in $\[P{H_3},\,As{H_3},\,{H_2}S\]$ and $\[{H_2}Se\]$.

Explanation:

• According to Drago's rule, the elements of groups 15 and 16 from period 3 and below do not take part in hybridisation.
• The bond angle in the compounds of those elements remains approximately $\[90^\circ \]$.
• Also, if the electronegativity of the combining elements are similar, in that also, the compound does not undergo hybridisation.
• In $\[P{H_3},\,As{H_3},\,{H_2}S\]$ and $\[{H_2}Se\]$, no hybridisation tales place because the central atom in these compounds belongs to groups 15 and 16 and period 3 and below.
• They have a bond angle around $\[90^\circ \]$, also the electronegativity difference between the central atom and the hydrogen is not very high.
• Therefore, they do not undergo hybridisation according to Drago's rule.
• On the other hand, $\[PC{l_3},\,P{F_3},\,N{(Si{H_3})_3}\]$ undergo $\[s{p^3}\]$ hybridisation while $\[Xe{F_2}\]$ undergoes $\[s{p^3}d\]$ hybridisation.