Question

Which of the following statement(s) is/are true for the electrophilic substitution in disubstituted benzene?

• A. If nature of both substituent oppose each other then the activating group decides the orientation of electrophile.
• B. If nature of both substituent oppose each other then the deactivating group decides the orientation of electrophile.
• C. If the nature of both substituents are activating then stronger activating group decides the orientation of electrophile
• D. If the nature of both substituents are deactivating then weaker deactivating group decides the orientation of electrophile

Answer 1

Answer: (A), (C)

If the nature of both substituents are activating then stronger activating group decides the orientation of electrophile

Electrophilic substitution in disubstituted benzene:
Case 1: When the nature of both the substituents reinforce each other, both the substituents direct the electrophile towards same position.

Case 2: When the nature of both the substituents oppose each other then the activating group decides the orientation of electrophile. The activating group predominates the deactivating group.

Case 3: When the nature of both substituents are activating then the stronger activating group decides the orientation of electrophile.

When both the substituents are deactivating then the stronger deactivating group decides the orientation of electrophile.

Hence, statement (a) and (c) are correct.