what should be the ideal explanation behind the order of stability of these three compounds?
Case-1
In these three examples the first two structures have a positive mesomeric effect and it is greater in case of fluorine due to 2p-2p orbital overlap where as in case of chlorine it is a 3p-2p orbital overlap and in the third case there is no such effect. overlapping factor has more importance while considered in acidic strength.
and order of stability should be: i>ii>iii
Case-2
The Inductive effect has a higher precedence over mesomeric effect in case of halogens present and since F is more electronegative than Cl the least stable structure will be the first one and then the second least stable is the second structure
and order of stability should be: iii>ii>i
which explanation is correct and where am I going wrong?