Question

The molecule which has pyramidal shape is :

• A. $PC{l}_3$
• B. $S{O}_3$
• C. $C{O}_3^{2-}$
• D. $N{O}_3^{-}$

Answer 1

The correct option is A $PC{l}_3$

$PC{l}_3$
$\text{Steric Number (x)}=\frac{1}{2}(3+5-0+0)$.
$\text{Steric Number (x)}=4$.
Hybridisation =$s{p}^3$
1 lone pair on phosphorous
shape = pyramidal


$S{O}_3$
$\text{Steric Number (x)}=\frac{1}{2}(0+6-0+0)$.
$\text{Steric Number (x)}=3$.
Hybridisation =$s{p}^2$
0 lone pair
shape = trigonal planar

$C{O}_3^{2-}$
$\text{Steric Number (x)}=\frac{1}{2}(0+4-0+2)$.
$\text{Steric Number (x)}=3$.
Hybridisation =$s{p}^2$
0 lone pair
shape = trigonal planar


$N{O}_3^{-}$
$\text{Steric Number (x)}=\frac{1}{2}(0+5-0+1)$.
$\text{Steric Number (x)}=3$.
Hybridisation =$s{p}^2$
0 lone pair
shape = trigonal planar