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Which of the following sequences represents the compounds in order of increasing acidity? o-cresol (a), salicylic acid (b), phenol (c)

1. c < a < b
2. b < c < a
3. a < b < c
4. a < c < b

Correct answer: a < c < b

Solution

o-Cresol is less acidic than phenol (methyl is electron-donating), while salicylic acid is a carboxylic acid (most acidic). So increasing acidity is a (o-cresol) < c (phenol) < b (salicylic acid).

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