Uses of Boron & Aluminium
Question
Which of the following is not a Lewis acid ?
Moderate
Solution
Even though Al+3 has empty d-orbitals in its valency shell ,it cannot extends its coordination number more than "6".
Due to small size of Al+3 and presence of six water molecules around the Al+3 ion,there is no scope to extend its coordination number.
Hence it cannot accept electron pair,therefore it cannot acts as lewis acid.
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