Question

In polymeric beryllium chloride $(BeC{l}_2{)}_n$, there are _______.

• A. three - centre two - electron bonds
• B. three - centre four - electron bonds
• C. two - centre three - electron bonds
• D. two - centre two - electron bonds

Answer 1

The correct option is B three - centre four - electron bonds

In polymeric beryllium chloride structure, $Be$ is bonded to four $Cl$ atoms. Since bridging Cl is bonded to 2 Be atoms in the polymer one via covalent and other via dative bond. So, it is called three - centre four-electron bonds (2 Be atom and 1 Cl atom).