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Question

The molecule in which an atom is associated with more than 8e is known as hyper valent molecule. All hyper valent molecules must have dπpπ bonding but the molecule having back bonding need not have always dπpπ bonding.
Which of the molecule is not hypervalent but completes its octet?

A
AlCl3
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B
AlBr3
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C
AlF3
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D
BF3
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Solution

The correct option is C AlF3
AlCl3,AlBr3,BF3 are covalent compounds. In all these molecules, central molecule has only six electrons in its valence shell. These complete their octet due to back bonding with the lone pair on the halogen. AlF3, it is an ionic compound which consists of Al3+ and 3F.

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