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Which of the following set of groups can...

Which of the following set of groups can show +R effect?

A

`-OH, - NH_2, -CHO`

B

`-C -= N, -COOH, -barCH_2`

C

`-OR, -NHCH_3, -NHCOCH_3`

D

`-COCl, -COOCH_3, -CH_3`

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