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 ?
A. `-F`
B. `-NC`
C. `-OCH_(3)`
D. `-C CI_(3)`
