Question & Answer: How does electron spin density (which are depicted by yellow clouds) end up on the meta…..

The electron density is maximum at ortho and para positions of benzene ring, this is because the substituent attached to benzene ring is an ortho- para directing group. This means, the negative charges will spread through the ortho and para carbn positions, meta position will not obtain any negative charge character. For example, if an electron donating group (ortho para directing group) is attached with benzene ring, it will be as follows.