Single Choice

Which of the following molecules has two lone pairs and bond angle (need not be all bond angles) < $$109.5^\circ$$?

A$$SF_2$$
B$$KrF_4$$
C$$IOI_4^-$$
DAll of the above
Correct Answer

Solution

SF2, KrF4 and IOI
−
4
have two lone pairs and bond angle (need not be all bond angles) < 109.5∘.
In SF2 molecule, the S atom undergoes sp3 hybridization with tetrahedral geometry. Due to repulsion between the bond pair and lone pair of electrons the bond angle decreases from tetrahedral value.
In KrF4 molecule, the central Kr atom undergoes sp3d2 hybridization with octahedral geometry. The bond angle is 90o.
In IOI
−
4
ion, the I atom undergoes sp3d2 hybridization with octahedral geometry. The bond angle is 90o.

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