Question

The maximum number of atoms that lie in the same plane in ${\mathrm{PCl}}_5$ molecule is

• A. $5$
• B. $4$
• C. $3$
• D. $2$

Answer 1

The correct option is B

$4$

Explanation for correct option

(b) $4$

• Geometry of Phosphorus pentachloride (${\mathrm{PCl}}_5$) is trigonal bipyramidal.
• There are $5$ bonds of Chlorine with $1$ Phosphorus atom.
• $3$ bonds in same plane and in upper and another down plane.
• Hence at most $4$ atoms ($1$ of Phosphorus and $3$ of Chlorine) are possible in one plane of ${\mathrm{PCl}}_5$ (as shown below in the figure).

Therefore, the correct option is (b) $4$

Explanation for incorrect options

Since, only four atoms lie in one plane. Therefore, options (a), (b) and (c) stand incorrect.

Therefore, the correct option is (b) $4$.