On the left are given decreasing orders of elements for a certain property and on the right side is given the property. The incorrect order for the given properties is:

1. ${\mathrm{AlF}}_3>\mathrm{MgO}>{\mathrm{MgF}}_2$    : Lattice energy

2. $\mathrm{Li}>\mathrm{Na}>\mathrm{Al}>\mathrm{Mg}$       : Electron affinity

3. ${\mathrm{PF}}_5>$ ${\mathrm{SF}}_6$ $>$ ${\mathrm{SiF}}_4$      : Lewis acidic character

4. ${\mathrm{SiCl}}_4>{\mathrm{SiBr}}_4$ $>{\mathrm{SiI}}_4$   : Decreasing ionic character