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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 following molecule is having complete octet?

A
BeCl2 (dimer)
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B
BeH2 (dimer)
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C
BeH2 (s)
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D
BeCl2(s)
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Solution

The correct option is D BeCl2(s)
This molecule have complete octet.
Be have 3e in valence shell and both Cl ions have 3e

In solid or in a crystal phase vanderwaals interactions are more. So, it forms tetra coordinate structure. These vanderwaals interactions are not bonds but only the interactions between electronegative Cl and electropositive Be.

709524_17431_ans_8e27bc6aa2b0453a95c42cbea9382a24.png

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