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In nitrobenzene, the group affects the electron density of the ring as follows:

  1. Ait increases the electron density, most at the ortho and para positions
  2. Bit leaves the electron density unchanged
  3. Cit decreases the electron density, most at the ortho and para positions
  4. Dit decreases the electron density, most at the meta position

Answer: C

has both -I and -M effects. The -M effect places a partial positive charge at the ortho and para carbons through resonance. The meta position is therefore the least deprived of electrons.
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