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

(1) Square pyramidal 

(2) Rectangular planar

(3) Square planar 

(4) Tetrahedral

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Chemical bonding and molecular structure

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Ans. (1) Square pyramidal

Sol. For AB4 compound possible geometry are

S. No.Bond pairLone pairTotalHybridisationGeometryPolarity
1404sp3Tetrahedralnon polar
2415sp3dSea-sawpolar
3426sp3d2Square Planarnon polar

Square pyramidal can be polar due to lone pair moment as the bond pair moments will get cancelled out.

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