Question

identify o/p director among given functional group -NO2 , CHO , OH, COOH​

Answer 1

Answer:

COOH is given more priority than the others given in the list.

Answer 2

OH is the o/p director among given functional groups.

Explanation:

Activating groups function as ortho‐para directors once they are attached to a benzene ring, meaning that they direct an approaching electrophile to the ortho or para positions.

• NO2 being electron withdrawing group, has charge concentrated at ortho and para positions. Due to this these positions are deactivated towards electrophilic aromatic substitution. Thus, NO2 could also be a meta-director.
• CHO and COOH group are meta directing since they have electron-withdrawing group with –R impact. There's +ve charge on ortho and para positions. So meta position is where the electrophilic substitution occurs .
• In phenol where OH group is present , the electron pair on the oxygen atom is in conjugation with ring. It is concluded, the ortho and para positions encounter high electron density. Subsequently , electrophilic substitutions takes put at the ortho and para positions within the ring.