In polymeric \( \left(\mathrm{BeCl}_{2}\right)_{n} \), there are : ...

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In polymeric \( \left(\mathrm{BeCl}_{2}\right)_{n} \), there are :
(a) three centre four-electron bonds
(b) three centre three-electron bonds
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(c) two centre three-electron bonds
(d) two centre two-electron bonds
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