for which of the following Bond angle can not be explained by VBT but can be explained by VSEPR theory

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SbH3

AsH3

PH3

NH3

answer is D.

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Detailed Solution

Bond angle in PH3, AsH3,SbH3 is around 90oE.C of 15th group -The three bonds are assumed to be, due to the overlap of pure 'p' orbitals of central atom and s-orbitals of H-atom∴the p-orbitals are mutually perpendicular to each other, The bond angle is about 90oThis explanation is based on VBTBut the bond angle in NH3 is 107.8oThis can not be explained by VBTAccording to VSEPR theory, the central atom of 'N' in NH3 contains '4' electron pairsThus its bond angle must be 109o 281 But due to lp-bp repulsions bond angle decreases to 107.8o

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