has the geometry:

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Bipyramidal

Square planer

Planer

none

answer is A.

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Detailed Solution

Concept- Valence Shell Electron Pair Repulsion theory ( VSEPR theory) is useful in predicting the geometry of molecules. According to this theory, electrons are arranged around the central atom of the molecule in such a way that there is minimum electrostatic repulsion between these electrons.
Now, the central atom in

molecule is a phosphorus atom.
In phosphorus chloride molecules, the phosphorus atom forms five bonds with five chlorine atoms. Thus, all five valence electrons of the central phosphorus atoms are consumed in the formation of five phosphorus-chlorine bonds. The number of lone pairs of electrons on a phosphorus atom is therefore zero.
Thus, the central phosphorus atom has five bond pairs of electrons and zero lone pairs of electrons. That means, the steric number of phosphorus is five.
For steric number five, the electron domain geometry is trigonal bipyramidal.
Since the number of lone pairs of electrons is zero, the molecular geometry and the electron domain geometry are the same as trigonal bipyramidal.
Therefore, the geometry of

is Bipyramidal.
Hence, the correct option is (1).

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