The correct increasing order of number of lone pair of electrons on the central atom of SnCl2, XeF2, CIF3 and SO3 is

1
\(\quad SO3 < CIF3 < SnCl2 < XeF2\)
2
\(\quad SO3 < SnCl2 < CIF3 < XeF2\)
3
\(\quad XeF2 < SnCl2 < CIF3 < SO3\)
4
\( \quad XeF2 < CIF3 < SnCl2 < SO3\)

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