Class 11 NEET Chemistry Organic Chemistry Some Basic Principles And Techniques Part 1

Groups like, -C l and −NO2 shows −I effect,−I groups attached to the benzene ring decrease the electron density and hence less prone to electrophilic attack. −OH not only shows −I effect but also +M effect which predominates the - I character and electron density is increased in the benzene ring which facilitates electrophilic attack.