Question

In the Liebermann's nitroso reaction, change in the colour of phenol occurs as:

• A. brown or red-greenish red-deep blue
• B. red-deep blue-green
• C. red-green-white
• D. white-red-green

Answer 1

The correct option is A brown or red-greenish red-deep blue

In Liebermanns nitroso reaction, phenol is treated with sodium nitrite in presence of concentrated sulphuric acid and heated gently to obtain a blue colour.
It is then diluted with water to obtain red solution. On basification, with dil. NaOH solution, it turns blue.
Thus, the colour change is brown or red-greenish red-deep blue.