Which one of the following functional groups is not meta directing?

Step-by-step solution

Key Idea The group which contain double bond in its structure and have more electronegative element bonded with the atom (which is bonded with the C-atom of benzene ring) gives m -directing products and those do not have double bond and have lone pair electron over the atom, (which is bonded with the benzene ring) do not give m-directing product (they give o and p -products). (a) - COOH group, contains double bond in its structure and - C-atom, which is bonded with the ring has more electronegative oxygen atom bond