1.

Which of the following groups shows the weakest `+R` effect?A. `O^(-)`B. `OH`C. `NH_(2)`D. `NR_(2)`

Answer» Correct Answer - B
The `+R` effect of each group is generally in the following order:
`O^(-)gt NH_(2)gt NR_(2)gtOH gt OMe, NHACgt MegtX`
`O^(-)` has the strogest `+R` effect on account of its negative charge and lone pair of electrons.


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