Question

In which of the following species $\mathrm{p\pi }-\mathrm{d\pi }$ bond is present but $\mathrm{p\pi }-\mathrm{p\pi }$bond is absent

• A. ${\mathrm{SiH}}_4$
• B. ${\mathrm{CS}}_2$
• C. ${\mathrm{SO}}_2$
• D. ${\mathrm{SO}}_2{\mathrm{Cl}}_2$

Answer 1

The correct option is D

${\mathrm{SO}}_2{\mathrm{Cl}}_2$

Correct answer explanation

Correct answer d. ${\mathrm{SO}}_2{\mathrm{Cl}}_2$

${\mathrm{SO}}_2{\mathrm{Cl}}_2$ forms $\mathrm{p\pi }-\mathrm{d\pi }$ bond, Sulphur has a d-orbital and oxygen has a p-orbital so it forms a bond with oxygen.

It forms a Sigma bond with chlorine. It has a tetrahedral shape with asymmetric distribution of charge on the Sulphur atom.

Structure

The explanation for the incorrect answer:

A. ${\mathrm{SiH}}_4$

Structure

Silicon has a tetrahedral shape as it forms a Sigma bond with hydrogen by the overlap of s and p_z orbital.

Hence, option (A) is incorrect

B. ${\mathrm{CS}}_2$

Structure

${\mathrm{CS}}_2$ forms a linear geometry by the overlap of p orbitals hence, option (B) is incorrect.

C. ${\mathrm{SO}}_2$

Structure

${\mathrm{SO}}_2$ forms bond by interaction. Hence, option (C) is incorrect.

Hence, option (D) is the correct answer.