The molecule in which an atom is associated with more than 8 electrons is known as hypervalent m...

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The molecule in which an atom is associated with more than 8 electrons is known as hypervalent molecule and less than 8 electrons is known as hypovalent molecule. All hypervalent molecules must have \( p \pi-d \pi \) bonding but the molecules having back bonding need not to have always \( p \pi-d \pi \) bonding.
Which of the following molecule is having complete octet :
(a) \( \mathrm{BeCl}_{2} \) (dimer)
(b) \( \mathrm{BeH}_{2} \) (dimer)
(c) \( \mathrm{BeH}_{2} \) (s)
(d) \( \mathrm{BeCl}_{2} \) (s)
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