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Question

Which of the following orbital overlaps are not allowed?

A

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B

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C

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D


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Solution

The correct option is D


Overlap of the lobes of same sign (phase) is called as positive overlap. They lead to attractive interactions between orbitals.
Overlap of lobes of opposite sign is called as negative overlap.
Option (a), (b) and (c) are positive overlaps and are allowed.
Option (d) is a negative overlap and is not allowed.

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