Yellow phosphorus reacts with chlorine to form phosphorus trichloride, PCl3.
Phosphorus trichloride, PCl3, can form a co-ordinate bond with a hydrogen ion to form HPCl3+.
BCl3 has three electron domains in a trigonal planar structure.
BCl3 is not a polar molecule, but PCl3 is.
Explain this difference using section 8 of the Data booklet.
PCl4+ has the same electron domain geometry as HPCl3+.
Explain why PCl4+ is not a polar molecule.
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