Difficult
Identify the atoms or groups from the following that exhibit $-R$ effect and $+R$ effect when present on a benzene ring:
$-OR, -NHCOR, -CN, -X, -NO_2, -NH_2, -CHO$
$-OR, -NHCOR, -CN, -X, -NO_2, -NH_2, -CHO$
- A
- B
- C
- D
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