Which of the following substance will increase the acidity of phenol?

Dil.

H_{2} S O_{4}

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Dil. HCl

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Conc.

H_{2} S O_{4}

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Conc.

C H_{3} C O O H

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Solution

The correct option is D Dil. $H_{2} S O_{4}$
Dilute $H_{2} S O_{4}$ will increase the acidity of phenol . This is because now phenol will be easily able to donate $H^{+}$ ion and delocalise its negative charge more efficiently . Also addition of dilute $H_{2} S O_{4}$ which is itself an acid increases the acidity of phenol.

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Which of the following substance will increase the acidity of phenol?

The correct option is D Dil. H2SO4Dilute H2SO4 will increase the acidity of phenol . This is because now phenol will be easily able to donate H+ ion and delocalise its negative charge more efficiently . Also addition of dilute H2SO4 which is itself an acid increases the acidity of phenol.