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Question

For which of the following compounds a valid Lewis structure cannot be drawn without violating the octet rule?

A
PO34
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B
SiF4
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C
CF4
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D
SeF4
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Solution

The correct option is D SeF4
The Lewis structure of PO34 is:

The central atom (P) has 10 valence electrons.

The Lewis structure of SiF4 is:
The central atom (Si) has 8 valence electrons.

The Lewis structure of CF4 is:
The central atom (C) has 8 valence electrons.

The Lewis structure of SeF4 is:
The central atom (Se) has 10 valence electrons.

Hence, PO34 and SeF4 violate the octet rule.

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