Electrophilic Aromatic Substitution

Each of the six compounds shown at the bottom of the page has two aromatic (benzene) rings. In every case the two rings are different and are labled A & B. If an electrophilic substitution, such as nitration or bromination, is carried out on each compound can the major product(s) be predicted?
Identify which ring (A or B) will be preferentially attacked, and indicate the orientation of the substitution (ortho/para, meta or all sites).

Compound Reactive
Ring
Substitution
Orientation
  Compound Reactive
Ring
Substitution
Orientation
  Compound Reactive
Ring
Substitution
Orientation
1. A
B
ortho/para
meta
all sites
2. A
B
ortho/para
meta
all sites
3. A
B
ortho/para
meta
all sites
4. A
B
ortho/para
meta
all sites
5. A
B
ortho/para
meta
all sites
6. A
B
ortho/para
meta
all sites


        

This script written by William Reusch, Dept. of Chemistry, Michigan State University. Please send comments and corrections to whreusch@pilot.msu.edu.