Rank the following groups in order of increasing activating power in electrophilic aromatic substitution reactions: 
-Br.
Definitions:
Dentists
Healthcare professionals specializing in the diagnosis, prevention, and treatment of diseases and conditions of the oral cavity.
Blocking
A learning process where the presence of an established conditioned stimulus interferes with the learning of a new conditioned stimulus.
Salience
The quality of being particularly noticeable or important; the state or condition by which something stands out from its surroundings or background in perception.
Behavioral Contrast
A phenomenon in which the rate of response varies according to a change in the reinforcement of an alternative behavior.
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