The ring deuteration of phenol:

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(C) The acidity of phenol is primarily determined by the stability of the phenoxide ion formed after the loss of a proton from the $-OH$ group. Ring d

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Imparts no effect

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(C) The acidity of phenol is primarily determined by the stability of the phenoxide ion formed after the loss of a proton from the $-OH$ group. Ring deuteration involves the replacement of hydrogen atoms on the aromatic ring with deuterium atoms. Since deuterium is an isotope of hydrogen,it has similar electronic properties but a slightly stronger $C-D$ bond compared to $C-H$. This substitution on the aromatic ring does not significantly alter the electronic environment of the $-OH$ group or the stability of the phenoxide ion. Therefore,ring deuteration has no significant effect on the acidity of phenol.

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