To determine the type of bond, we need to consider the nature of the elements involved and their electronegativity differences:
For substances with polar covalent bonds (PF3\mathrm{PF}_{3}PF3, BCl3\mathrm{BCl}_{3}BCl3, SCl2\mathrm{SCl}_{2}SCl2), we arrange them by increasing bond polarity. Bond polarity is determined by the difference in electronegativity between the bonded atoms:
Order of increasing bond polarity for polar covalent substances: BCl3→SCl2→PF3 \boxed{\mathrm{BCl}_{3} \rightarrow \mathrm{SCl}_{2} \rightarrow \mathrm{PF}_{3}} BCl3→SCl2→PF3
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