Explain the following substituent effects on acidity.
(i)
Acetic acid pKa = 4.74
Chloroacetic acid pKa = 2.86
Dichloroacetic acid pKa = 1.26
(ii)
p-methoxy pKa = 4.46
m-nitro pKa = 3.47
p-nitro pKa = 3.41
i} Acetic acid pKa = 4.74
ii) m-nitro pKa = 3.47
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