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Which of the following group show +M and -I effect?

(A) $\ce{-\underset{\underset{\huge O}{||}}{C}-F}$
(B) $\ce{-\underset{\underset{\huge O}{||}}{C}-OR}$
(C) $\ce{-O^-}$
(D) $\ce{-OH}$

Answer is option D. D is obviously correct, but why not option C? $\ce{-O^-}$ has electrons to donate and is electronegative.

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  • $\begingroup$ O- is an electron-rich species, which donates its charge to the ring, stringly activating it. It has a very strong +I effect! $\endgroup$ – The_Vinz Jul 9 at 6:27

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