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Which of the following groups shows the ...

Which of the following groups shows the weakest `+R` effect?

A

`O^(-)`

B

`OH`

C

`NH_(2)`

D

`NR_(2)`

Text Solution

Verified by Experts

The correct Answer is:
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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