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(C) $SF_4$ does not have equal bond angles because of its structure,which is see-saw (derived from trigonal bipyramidal).Sulfur in $SF_4$ has a total

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$SF_4$

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(C) $SF_4$ does not have equal bond angles because of its structure,which is see-saw (derived from trigonal bipyramidal).Sulfur in $SF_4$ has a total of six valence electrons,four of which form bonds with fluorine atoms and two form a lone pair.Due to the presence of a lone pair,the bond angles deviate from the ideal trigonal bipyramidal angles of $90^\circ$ and $120^\circ$.The equatorial $F-S-F$ bond angle is approximately $102^\circ$ and the axial $F-S-F$ bond angle is approximately $173^\circ$ due to lone pair-bond pair repulsion.In contrast,$SiF_4$ ($sp^3$,tetrahedral),$ICl_4^-$ ($sp^3d^2$,square planar),and $PCl_4^+$ ($sp^3$,tetrahedral) have equivalent bond angles due to their symmetric geometries.

In which of the following molecules/ions are all the bond angles not equal?

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