Attached is a review sheet for an upcoming exam, and I've run into a few problems with it. The biggest confusion stems from ranking the three bonds in terms of strength. If you look at the attachment, the answer in 2e talks about resonance structures by bond #2, but I don't see it? Also how would one determine an accurate bond order from the picture alone? Locally bond 2 and 3 look identical, so I'm having troubles differentiating them. Any help is welcome, thanks.