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Question

Which of the following groups does not exhibit +M effect when attached with benzene?
  1. PhNH2
  2. Ph+NH3
  3. PhOH
  4. PhCl


Solution

The correct option is B Ph+NH3
+M effect is defined as the polarity produced in the molecule by the interaction of two pi bonds or between a pi bond and a lone pair of electron present on an adjacent atom.
The nitrogen in option (b) is already protonated, so its lone pair is not available for this interaction. Hence it will not show +M effect.

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