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Which one of the following is the correct statement?

1. Boric acid is a protonic acid
2. Beryllium exhibits coordination number of six
3. Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase
4. B2H6.2NH3 is known as 'inorganic benzene'

Correct answer: Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase

Solution

Beryllium and aluminum chlorides form bridged structures in their solid phases due to the presence of covalent bonds and the ability to form dimeric or polymeric arrangements, which is characteristic of their chemistry.

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