Rank the following activating groups in order of decreasing strength of activation,listing the most activating first.
A)IV II III I
B)II III IV I
C)III IV II I
D)II IV III I

Question

Rank the following activating groups in order of decreasing strength of activation,listing the most activating first. 
A)IV > II > III > I 
B)II > III > IV > I 
C)III > IV > II > I 
D)II > IV > III > I

Quizplus · Accepted Answer

Activating groups increase the electron density in the benzene ring, making it more likely to undergo electrophilic aromatic substitution. 
Among the given groups, the most activating group is nitro (-NO2), followed by amino (-NH2), then methoxy (-OCH3), and finally methyl (-CH3). Therefore, option B is the correct order of decreasing strength of activation.

Rank the Following Activating Groups in Order of Decreasing Strength