If we break the shown C-H bonds, from where, upto where, resonance occur?

Also how many alpha-H bonds are there w.r.t the radicle 2, 4 and 5? My teacher doesn't count the alpha- H on double bonds. For eg, while finding the alpha-h wrt the radicle 2, he counts only the alpha-H at 1 and not on 3, giving a total of 3 alpha-H. But I never understood why he did that, I always count the one on double bond and got 4 alpha-H for the above example.

Also how many alpha-H bonds are there w.r.t the radicle 2, 4 and 5? My teacher doesn't count the alpha- H on double bonds. For eg, while finding the alpha-h wrt the radicle 2, he counts only the alpha-H at 1 and not on 3, giving a total of 3 alpha-H. But I never understood why he did that, I always count the one on double bond and got 4 alpha-H for the above example.