Q.

Orientation of electron pairs in BrF5 molecule is

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a

Square planar

b

Square pyramidal

c

Octahedral

d

Distorted octahedral

answer is C.

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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, BrF5, XeF4 ; Number lone pairs on central atom(LP)=EP-BP ;                                                          =0,1,2 respectively in SF6, BrF5, XeF4 ; SF6-'6' bp +'0' lp on central atom; sp3d2-Squre bipyramidal (or) Octahedral ; 18 lone pairs/molecule BrF5-'5' bp +'1' lp on central atom ; sp3d2-Squre pyramidal ; 16 lone pairs/molecule XeF4-'4' bp +'2' lp on central atom ; sp3d2-Square planar ; 14 lone pairs/molecule Note; Each bonded halogen atom has '3' lone pairs on it ; Orientation of electron pairs is octahedral (or) Square bipyramidal in all the three molecules ;
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Orientation of electron pairs in BrF5 molecule is