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Chapter 3: Problem 55

Phenol on warming with conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) and \(\mathrm{NaNO}_{2}\) gives brown colour. On adding \(\mathrm{NaOH}\) solution, the colour changes to green or blue. This test is called (a) Victor Meyer's test (b) Libermann's test (c) Lucas test (d) Baeyer's test

Short Answer

Expert verified
Answer: Liebermann's test.

Step by step solution

01

Memorize the Liebermann's Test Reaction

Liebermann's test is a chemical test performed on phenols. It involves the reaction of phenol with concentrated sulfuric acid (H₂SO₄) and sodium nitrite (NaNO₂). The reaction produces a brown colored solution, which, upon the addition of sodium hydroxide (NaOH), changes to green or blue color.
02

Analyze the Descriptions of the Tests Provided in the Exercise

The given exercise describes a test where phenol is warmed with concentrated H₂SO₄ and NaNO₂ and forms a brown-colored solution. Then, upon the addition of NaOH, the color changes either to green or blue. This description matches with the Liebermann's test reaction mentioned in Step 1.
03

Identify the Correct Option

Since the exercise's description matches with the Liebermann's test, the correct option is (b) Liebermann's test.

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