Four different structures (a), (b), (c), and (d) can be drawn for compounds named dibromobenzene, but only three different compounds actually exist. Explain. (a)

(b)

(c)

(d)

Video transcript

Hey everyone we're asked for molecules such as Eileen, it is possible to draw four distinct structures, yet only three different compounds actually exist. Why? So looking at our structures, we can see that the first one is going to be para xylene. Our second one is going to be meta Shailene, Our 3rd 1 is going to be Ortho Z Eileen. And lastly the 4th 1 is also going to be meta xylene. Now let's go ahead and compare our two metas Eileen's. When we look at our second one, if we go ahead and create a resonance structure, like so we end up with our fourth structure. So our answer here is going to be a because two and four are resident structures as we just explained now, I hope that made sense. And let us know if you have any questions.