First slide

Atomic and physical properties

Question

In Al₂Cl₆, the covalency of aluminium is

Moderate

A

6
B

4
C

3
D

2

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 Al₂Cl₆dimer
$\therefore$ AlCl₃achieves stability by forming a dimer Al₂Cl_6.
In the dimer around the Al four fonds are present and the covalency of Al in Al₂Cl₆is four.

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