Which of the following is most powerful meta directing group.

Which of the following is not a meta-directing group in electrophilic aromatic substitution?

Which of the following is not meta-directing group in electrophilic aromatic substitution reactions ?

In the electrophilic substituion of benzene ring, the second substituent is directed by the group already present. Electron releasing groups (+I and +M) are ortho-para-directing and activating, whreas the electron withdrawing groups (-I and -M) are meta-directing and deactivating. Halogens are placed under the category of +T (Tautomeric) groups because they have -Ibdyctuve abd +Mesomeric effect. These groups are deactivating but ortho-para-directing. In the introduction of third group to the benzene ring, the product of minimum steric gindrance is formed. Which of the following is not an ortho, para-directing group ?

Which of the following groups are meta-directing :

Which among the following is a meta directing group?

Which among the following is a meta directing group?

Which of the following is meta directing group?