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Question

The structures of beryllium chloride in the solid state and vapour phase, respectively are
 
  1. chain and chain
  2. dimeric and chain
  3. chain and dimeric
  4. dimeric and dimeric


Solution

The correct option is C chain and dimeric
The structures of beryllium chloride in the solid state and vapour phase, respectively are chain and dimeric. In vapour phase at above 900 C. BeCl2 is monomeric having a linear structure ClBeCl. The bonding in BeCl2 is covalent and Be atom accommodates 2 + 2 = 4 electrons in the two sp hybrid orbitals. Below 900 C, beryllium chloride in vapour phase exists as a mixture of monomer BeCl2 and dimer Be2Cl4

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