Q.

In Al2Cl6, the covalency of aluminium is

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a

6

b

4

c

3

d

2

answer is B.

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Detailed Solution

→ Sizes of Al and Cl are large, therefore in between the Al and Cl "π" bond formation is not possible.→In order to get octet configuration around the "Al" AlCl3 undergoes dimerisation and forms Al2Cl6  dimer AlCl3 achieves stability by forming a dimer Al2Cl6.In the dimer around the Al four fonds are present and the covalency of Al in Al2Cl6 is four.
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