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The maximum covalency of aluminium is ‘6’ where as that of boron is ‘4’ because
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Correct option is C
Al contains empty d-orbitals in its valency shell that is in third shell,therefore it can extends its valency up to 6.Where as Boron doesnot contain empty d-orbitals in its valency shell and hence it cannot extends its valency to six and its maximum valency is 4,due to presence of 4 valency orbitals i.e.,one ns and three -np orbitals.Similar Questions
The bond dissociation energy of BF bond in BF3 is 646 kJ mol–1 whereas that of CF in CF4 is 315 kJ mol–1. The correct reason for higher BF bond dissociation energy as compared to that of CF bond is :
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