Which one of the following substituents at para-position is most effective in stabilizing the phenoxide ion?

- C H_{3}

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- O C H_{3}

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- C O C H_{3}

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- C H_{2} O H

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Solution

The correct option is C $- C O C H_{3}$
Electron withdrawing group stabilises the benzene ring due to delocalisation of charge. − $C H_{3}$ and − $C H_{2} O H$ are electron-donating groups and hence decrease the stability of the benzene ring. − $O C H_{3}$ is a weaker electron-withdrawing group than − $C O C H_{3} .$

Hence, − $C O C H_{3}$ group more stabilize the phenoxide ion at para-position.

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