Which among following functional groups exhibits $-\mathrm{R}$ effect?

Which among following functional groups exhibits $-\mathrm{R}$ effect?
  1. $-\mathrm{CO}-$
  2. $-\mathrm{Br}$
  3. $-\mathrm{OR}$
  4. $-\mathrm{NHR}$

Solution

$-\mathrm{CO}-$ exhibits $-\mathrm{R}$ effect

Asked in: MHT CET 2021 (22 Sep Shift 2)

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