A) \[PC{{l}_{5}}\]
B) \[CC{{l}_{4}}\]
C) \[PC{{l}_{3}}\]
D) \[POC{{l}_{3}}\]
Correct Answer: A
Solution :
\[PC{{l}_{5}}\], exists in nature in gas phase, but ionic in solid state. X-ray studies have shown solid \[PC{{l}_{5}}\] to be a salt containing the tetrahedral cation \[{{[PC{{l}_{4}}]}^{+}}\] and the octahedral anion \[{{[PC{{l}_{6}}]}^{-}}\]. The phosphorus atom in this hexachlorophosphate-(V) anion, is seen to have extended its valence shell to \[12{{e}^{-}}\]. In the vapour state, phosphorus penta-chloride consists of discrete \[PC{{l}_{5}}\] molecules having a trigonal bipyramidal shape.
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