NTA Abhyas NEET2020Chemistryp Block Elements (Group 13 & 14)Practice
Which of the following sequence is not correct for the property mentioned against it?
Options
- AB F 3 < B C l 3 < B B r 3 < B l 3 (the lewis acid strength)
- BC O 2 < S i O 2 < S n O 2 < P b O 2 (increasing oxidising power)
- CTl < ln < Ga < Al (stability of +1 oxidation state)
- DAl   <   Ga   <   ln   <   Tl (stability of +1
Correct answer
C. Tl < ln < Ga < Al (stability of +1 oxidation state)
Step-by-step 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.