Which of the following substituents is an ortho, para director?

Question

Quizplus · Accepted Answer

The substituent "NHCOR" is an ortho, para director because it has a lone pair of electrons on the nitrogen atom, which can donate electrons to the ring and stabilize the intermediate carbocation formed during electrophilic aromatic substitution. This increases the electron density at the ortho and para positions relative to the meta position, making it an ortho, para director. The other substituents in the options do not have a lone pair on the atom directly attached to the ring, and therefore cannot donate electrons to the ring in the same way.

Which of the Following Substituents Is an Ortho, Para Director