In the Liebermann's nitroso reaction, sequential changes in the colour of phenol occurs as

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Red $\to$ deep blue $\to$ green

green $\to$ red $\to$ deep blue

Red $\to$ green $\to$ white

White $\to$ red $\to$ green

answer is A.

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Detailed Solution

When phenol is reacted with NaNO₂ and concentrated H₂SO₄, it provides a deep green or blue colour which changes to red on dilution with water. Generated substance in presence of NaOH / KOH restores original green or blue colour. This reaction is termed as Liebermann's nitroso reaction.

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