Account for the following observations: (i) AlCl 3 is a 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 than SnO 2 (iv) The +1 oxidation state of thallium is more stable than its +3 state.

Options

1. A(i) Electron deficiency in Al (ii) Smaller size of F (iii) Greater number of oxygen atoms (iv) Inert pair effe
2. B(i) Electron deficiency in Al (ii) Larger size of F (iii) Greater number of oxygen atoms (iv) Inert pair effec
3. C(i) Electron deficiency in Cl (ii) Smaller size of F (iii) Lesser number of oxygen atoms (iv) Inert pair effec
4. D(i) Electron deficiency in Cl (ii) Larger size of F (iii) Lesser number of oxygen atoms (iv) Inert pair effect