Which of the following groups does not show (+R) effect?

Which of the following groups does not show (+R) effect?
  1. - NH $_{2}$
  2. -NHCOR
  3. -CN
  4. -NR

Solution

$-\mathrm{CN}$ shows $(-\mathrm{R})$ effect.

Asked in: MHT CET 2020 (15 Oct Shift 1)

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