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Q.

If AB4 molecules is a polar molecule, a possible geometry of AB4 is:

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a

Square planar

b

Rectangular planar

c

Tetrahedral

d

Square pyramidal

answer is D.

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Detailed Solution

(A) If AB4 is a square planar molecule, then

Question Image

Given that the vector sum of the dipole moment is zero, it should not be polar.


(B) If the rectangular planer AB4 is true, then
Question Image
Given that the vector sum of the dipole moment is zero, it should not be polar.
(C) Since AB4 has no lone pairs and is a tetrahedral molecule, their structure should be:
Question Image
Additionally, due to perfect symmetry, it should not be polar.

(D)If AB4 has a square pyramidal shape, then its lone pair should have the following structure:
Question Image
and it ought to be polar because a single pair of 'A's' dipole moment cannot ever be cancelled by another pair.

Therefore, the correct option is D Square Pyramidal

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