If the AB4 molecule is a polar molecule, a possible geometry of AB4 is:
If the AB4 molecule is a polar molecule, a possible geometry of AB4 is:
The correct option is C Square pyramidal
Explanation for the correct option:
For AB4 compound possible geometry is:
Structure with sp3d2 hybridization is polar due to lone pair moment while in other possibilities molecules are non-polar.
Square pyramidal can be polar due to lone pair moments as the bond pair moments will get canceled out.
(c) Square pyramidal:
If AB4 molecule is a square pyramidal then it has one lone pair and their structure should be
and it should be polar because the dipole moment of the lone pair of 'A' never is canceled by others.
Explanation for the incorrect option:
(a) Square planar:
If AB4 molecule is a square planar.
it should be non-polar because the vector sum of dipole moment is zero.
(b) Tetrahedral:
If AB4 molecule is tetrahedral then it has no lone pair and their structure should be
and it should be non-polar due to perfect symmetry.
(d) Rectangular planar:
If AB4 molecule is a rectangular planer then
it should be nonpolar because the vector sum of dipole moment is zero.
Final Answer: Hence the correct answer is an option (c)
Square pyramidal
Explanation for the correct option:
For AB4 compound possible geometry is:
Structure with sp3d2 hybridization is polar due to lone pair moment while in other possibilities molecules are non-polar.
Square pyramidal can be polar due to lone pair moments as the bond pair moments will get canceled out.
(c) Square pyramidal:
If AB4 molecule is a square pyramidal then it has one lone pair and their structure should be
and it should be polar because the dipole moment of the lone pair of 'A' never is canceled by others.
Explanation for the incorrect option:
(a) Square planar:
If AB4 molecule is a square planar.
it should be non-polar because the vector sum of dipole moment is zero.
(b) Tetrahedral:
If AB4 molecule is tetrahedral then it has no lone pair and their structure should be
and it should be non-polar due to perfect symmetry.
(d) Rectangular planar:
If AB4 molecule is a rectangular planer then
it should be nonpolar because the vector sum of dipole moment is zero.
Final Answer: Hence the correct answer is an option (c)
