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a
Square planar
b
Square pyramidal
c
Octahedral
d
Distorted tetrahedral
answer is B.
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Detailed Solution
Number of electron pairs(EP)=V+M-C+A2; V=Group number of central atom; M=-H, -X, -OH....monovalent groups attached to central atom ; C=Charge of cation ; A=Charge of anion ; V=6,7,8 respectively for 16th, 17th, 18th group elements ; Number bond pairs, BP(according to VSEPR theory)=Number of atoms directly attached to central atom; =6,5,4, respectively in SF6,IF5, XeF4 ; Number lone pairs on central atom(LP)=EP-BP ; =0,1,2 respectively in SF6, IF5, XeF4 ; IF5-'5' bp +'1' lp on central atom ; sp3d2-Square pyramidal ; 16 lone pairs/molecule