In which of the following bond angle can not be explained by Valence Bond Theory ?

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H₂S

H₂Po

H₂Te

H₂O

answer is A.

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Detailed Solution

Valence Bond Theory (VBT) is a model that explains chemical bonding in terms of overlapping atomic orbitals. It can generally explain the bond angles observed in simple molecules.

However, there are cases where VBT fails to explain certain bond angles. For example, VBT cannot explain the bond angle of 107 degrees observed in the water molecule (H₂O). This is because VBT assumes that all atomic orbitals are equivalent and that they overlap to form hybrid orbitals with specific geometries. However, in the case of water, the two lone pairs of electrons on the oxygen atom occupy non-hybridized p orbitals, which distort the geometry and cause the bond angle to deviate from the expected value of 109.5 degrees.

Therefore, if the list of bond angles includes water, the bond angle of 107 degrees in water cannot be explained by Valence Bond Theory. However, if you provide the list of bond angles, I can assist you in identifying any other bond angles that may not be explained by VBT.

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