Question

Which of the following pair of molecules will have permanent dipole moments for both members?

• A. $Si{F}_4$and $N{O}_2$
• B. $C{O}_2$ and $N{O}_2$
• C. $C{O}_2$ and $O_3$
• D. $Si{F}_4$ and $C{O}_2$

Answer 1

The correct option is A $Si{F}_4$and $N{O}_2$

As $C{O}_2$ is a linear molecule, thus its net dipole moment is zero.

(Refer to Image 1)

$Si{F}_4⟶$ tetrahedral geometry (Refer to Image 2)

Net dipole moment is not zero.

$N{O}_2⟶$ bent structure, because of lone pair of Nitrogen

(Refer to Image 3)

Thus net dipole moment is not zero.

Thus $Si{F}_4$ & $N{O}_2$ both contain permanent dipole moment.