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Which of the following statements is correct?

1. Boric acid behaves as a protic acid.
2. Beryllium commonly shows a coordination number of six.
3. In the solid state, the chlorides of both beryllium and aluminium exist with bridged structures.
4. B2H6·2NH3 is referred to as inorganic benzene.

Correct answer: In the solid state, the chlorides of both beryllium and aluminium exist with bridged structures.

Solution

Beryllium and aluminum chlorides form bridged structures in their solid states due to the presence of dimeric units, which involve bridging chloride ions between metal centers, reflecting their covalent character and coordination chemistry.

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