Which one of the following gives a violet colour with neutral $\mathrm{FeCl}{}_3$ solution?

More questions on Phenols: acidity, Kolbe, Reimer-Tiemann, electrophilic substitution

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• Given pK_a values: phenol 10.0, 4-methylphenol 10.3, 3-nitrophenol 8.4, 4-nitrophenol 7.2. The decreasing order of acidity is JEE Main level