[deutdeut]

Now it's accepted that benzene has a delocalized structure, and it's represented by the circle in a hexagon. But the Kekule structure is still used by some textbooks, but isn't that the Kekule structure of benzene does not represent the real structure of benzene? Why is the kekule structure can still be used in writing equations?

[Borek]

By convention. But you are right that it shouldn't be used.

[Chudasama]

i draw the Kekule structure to explain the selectivity of electrophilic aromatic substitution on substituted aromatic rings.

don't think you can use the circle in a hexagon representation to explain this

[deutdeut]

But we use the Kekule form to represent benzene. but isn't the pi-bond do not actually localise between the two bonded carbon atoms? Is the bonding between the carbon atoms are ALL single-bonded, and double bond do NOT exist as shown in the Kekule structure?The pi-bond does not belong to any pairs of carbon atoms?

[ChinesePink]

By convention. But you are right that it shouldn't be used.

I agree with you.
e.g,the butadiene,it's real structure likes the benzene too.The benzene we can use a circle in the middle to represented it,but the butadiene can be used nothing.

[deutdeut]

So, are the carbon atoms in benzene are actually joined by single bonds?

[Mitch]

Because all Chemist's know that the electrons in benzene are delocalized. We don't need to be reminded about something we all know. What would you do for anthrocene? Anthrocene will have some bonds that are neither double, nor single nor 1.5bonds. Best to just draw kekule and worry about bond order at a later stage, if we need to.