(a) Which of the following has all idealized bond angles just slightly less than

Question

(a) Which of the following has all idealized bond angles just slightly less than 120?
BF3
NH3
SF6
ClF3



(b) Which molecule has only 90 and 180 bond angles and one lone pair of electrons on the central atom?
XeF4
SeF4
BCl3
ClF5


(c) When the lone pair of electrons in SF4 is placed at the equatorial position, which of the following is true?
The molecular geometry is trigonal bipyramidal.
There are no bonding pairs at 90 angles to each other.
The lone pair has 2 bonding pairs at 90 and 2 at 120 angles.
There are larger repulsions.

(d) When there are 3 lone pairs around the central atom with 5 electron pairs, the lone pairs occupy which of the following?
all axial positions
one axial and two equatorial positions.
two axial and one equatorial positions
all equatorial positions


(e) Which of the following statements is true concerning the geometries of CF4 and NF3?
The two molecules have the same molecular geometry.
The two molecules have the same molecular geometry but different electron pair geometries.
The two molecules have different electron pair geometries.
The two molecules have the same electron pair geometry but different molecular geometries.

Explanation / Answer

a) BF3

b) SeF4

c) The molecular geometry is trigonal bipyramidal.

d) all equatorial positions

e) The two molecules have different electron pair geometries

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