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Q.

Aluminum chloride forms a dimer because aluminum 

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a

belongs to the third group

b

is a metal.

c

has a high ionization energy.

d

has a high coordination number.

answer is D.

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Detailed Solution

  • Aluminum belongs to third period and has vacant d-orbitals. This implies that it can accommodate electrons from Cl, thereby has a high coordination number. 
  • AlCl3 is a Lewis acid (or electron deficient specie) as it has an incomplete octet, hence take electron pair from another Cl atom. 
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