Question

Among the following compounds the one that is polar and has the central atom with $s{p}^2$ hybridisation is

• A. $B{F}_3$
• B. $HCl{O}_4$
• C. $H_{2}C{O}_3$
• D. $Si{F}_4$

Answer 1

The correct option is C $H_{2}C{O}_3$

a) In $B{F}_3$, $B$ is $s{p}^2$ hybridised, has trigonal planar geometry and is symmetric. So, it is not a polar molecule.
b) In $HCl{O}_4$, $Cl$ is $s{p}^3$ hybridised.
c) In $H_{2}C{O}_3$, $C$ is $s{p}^2$ hybridised and the $C=O$ dipole is not balanced by $C-O$ dipoles, thus it is also a polar molecule.
d) In $Si{F}_4$, $Si$ is $s{p}^3$ hybridised.