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  • Which one of the following combination is not allowed in the LCAO method for the formation of a molecular orbital (Consider Z- axis as the molecular axis)?Option

Which one of the following combination is not allowed in the LCAO method for the formation of a molecular orbital (Consider Z- axis as the molecular axis)?

Option: 1

S + Px


Option: 2

S + Pz


Option: 3

Px + Px


Option: 4

Pz + Pz


Answers (1)

best_answer

As we learn

Condition for combination of atomic orbitals -

Combining atomic orbital must have the same or nearly the same energy.

- wherein

1S can combine with another 1S orbital but not with 2S orbital.

 

 S and Px  orbitals do not have proper orientation to overlap and hence MO is not formed.

Along z -direction it is not possible with Px.

Therefore, the correct option is (1).

 

Posted by

jitender.kumar

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