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Q.

Which of the following chloride is most unstable?

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a

TlCl3

b

BCl3

c

Al2Cl6

d

AlCl3

answer is D.

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Detailed Solution

  • The order of elements in IIIA group is Boron, Aluminium, Gallium, Indium and Thallium.
  • While moving down the group the tendency to form +1 oxidation state increases and the tendency to form +3 oxidation state decreases. So, thallium is more stable in +1 oxidation state. 
  • Hence, TlCl3 is the most unstable.
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