Question

Which of The Following Molecule Is Planar?

• A. ${\mathrm{CH}}_4$
• B. ${\mathrm{C}}_2{\mathrm{H}}_4$
• C. ${\mathrm{PCl}}_3$
• D. ${\mathrm{SiCl}}_4$

Answer 1

The correct option is B

${\mathrm{C}}_2{\mathrm{H}}_4$

Explanation for the correct option:

Hybridization:

• “Hybridization is defined as the process of intermixing of the orbitals of slightly different energies so as to redistribute their energies, resulting in the formation of a new set of orbitals of equivalent energies and shape.”

(B) ${\mathrm{C}}_2{\mathrm{H}}_4$

• The $‘\mathrm{C}’$ in Ethane molecule is ${\mathrm{sp}}^2$hybridized with Planer geometry.
• The structure of Ethane is given below:

Explanation for the incorrect options:

(A) ${\mathrm{CH}}_4$

• The $‘\mathrm{C}’$ in methane molecule is ${\mathrm{sp}}^3$ hybridized with Tetrahedral geometry.
• The structure of methane is given below:

(C) ${\mathrm{PCl}}_3$

• The $‘\mathrm{P}’$ in ${\mathrm{PCl}}_3$ is ${\mathrm{sp}}^3$ hybridized Trigonal pyramidal with geometry.
• The structure of Phosphorus trichloride is given below:

(D) ${\mathrm{SiCl}}_4$

• The $‘\mathrm{Si}’$ in ${\mathrm{SiCl}}_4$ is ${\mathrm{sp}}^3$hybridized with Tetrahedral geometry.
• The structure of Silicon tetrachloride is given below:

Hence, the correct option is (B) i.e.${\mathrm{C}}_2{\mathrm{H}}_4$ is a planar molecule.