Account for the following observation: (i) AlCl_(3) is Lewis acid (ii) Though fluorine is more electronegative than chlorine yet BF_(3) is a weaker Lewis acid than BCl_(3) (iii) PbO_(2) is a stronger oxidising agent thatn SnO_(2) (iv) The +1 oxidation state of thallium is more stable than its +3state.

Account for the following observation: (i) AlCl_(3) is Lewis acid (i

1.	Account for the following observation: (i) AlCl_(3) is Lewis acid (ii) Though fluorine is more electronegative than chlorine yet BF_(3) is a weaker Lewis acid than BCl_(3) (iii) PbO_(2) is a stronger oxidising agent thatn SnO_(2) (iv) The +1 oxidation state of thallium is more stable than its +3state.
Answer» Solution :(i) `AlCl_(3)` is a Lewis acid because the central Al ATOM has a sextel of electrons after SHARING. It is electron deficient and `AlCl_(3)` BEHAVES as a Lewis acid. (ii) For answer, consult SECTION 11.12. (iii) +2 oxidation state of Pb in `PbO_(2)` is more stable than +2 oxidatin state of Sn in `SnO_(2)` due to greater INERT pair effect. This means that `PbO_(2)` is a stronger oxidising agent than `SnO_(2)` and changes to +2oxidisionstate more easily. (iv) For answer, consult section 11.2.