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Organic Chemistry

Cool goIITian

Joined:	10 May 2008
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18 Aug 2008 15:40:00 IST

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578

acidity

None

which of the following would increase the acidity of phenol

a)Dil. H₂SO₄ b)Dil HCl c)Conc. H₂SO₄ d)Conc. CH₃COOH

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debasis mohanty

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Joined: 4 Aug 2008

Posts: 12

18 Aug 2008 20:18:25 IST

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Conc. H₂SO₄ will increase the acidity of phenol. Because when conc. H₂SO₄ is treated with phenol electrophilic substitution reaction takes place producing o-hydroxy benzene sulphonic acid is produced. Since Sulphonic acid group ( -SO₃H) is an electron withdrawing group. Precence of electron with drawing group increases the acidity of phenol.

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