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The set of meta directing functional groups from the following sets is:
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Due to the presence of some groups, the electron density decreases on ortho and para positions. So, the electron density on meta position is relatively higher than ortho and para positions. Thus, these groups directs the electrophilic substitution on meta position.
Due to the presence of some groups, the electron density decreases on ortho and para positions. So, the electron density on meta position is relatively higher than ortho and para positions. Thus, these groups directs the electrophilic substitution on meta position. If the atom of group which is attached to benzene ring has pi bond then that group act as meta directing group.
All are Hence meta directing groups.
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