Which of the following sequence is not correct for the property mentioned against it?

Which of the following sequence is not correct for the property mentioned against it?
  1. BF3<BCl3<BBr3<Bl3 (the lewis acid strength)
  2. CO2<SiO2<SnO2<PbO2 (increasing oxidising power)
  3. Tl < ln < Ga < Al (stability of +1 oxidation state)
  4. Al < Ga < ln < Tl (stability of +1 oxidation state)

Solution

As due to inert pair effect stability of lower oxidation state increases down the group. So order given in option 3 is incorrect and the correct order is in given in option 4 here. Properties given in option 1 and 2 are in correct order.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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