Menthol and menthone, the main constituents of oil of peppermint, can be made synthetically from thymol by the following route. I II thymol menthol menthone (a) State the type of reaction of - reaction I. - reaction II. (b) Suggest one test for each of the three compounds that would give a positive result with the stated compound but a negative result with both the other two compounds. thymol - test - observation menthol - test - observation menthone - test - observation

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Menthol and menthone, the main constituents of oil of peppermint, can be made synthetically from thymol by the following route - CIE - A-Level Chemistry - Question 3 - 2010 - Paper 1

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Menthol and menthone, the main constituents of oil of peppermint, can be made synthetically from thymol by the following route. I II thymol ... show full transcript

Worked Solution & Example Answer:Menthol and menthone, the main constituents of oil of peppermint, can be made synthetically from thymol by the following route - CIE - A-Level Chemistry - Question 3 - 2010 - Paper 1

Step 1

State the type of reaction of reaction I.

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Answer

The type of reaction of reaction I is reduction or hydrogenation.

Step 2

State the type of reaction of reaction II.

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Answer

The type of reaction of reaction II is oxidation or redox.

Step 3

Suggest one test for thymol.

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Answer

Test: Br₂(aq) or NaOH(aq) or FeCl₃(aq). Observation: It decolourises or produces a white precipitate or dissolves or gives a violet/purple colour respectively.

Step 4

Suggest one test for menthol.

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Answer

Test: Cr₂O₇²⁻/H⁺ or Lucas test or ZnCl₂/HCl. Observation: It changes from orange to green or produces a cloudy or white precipitate.

Step 5

Suggest one test for menthone.

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Answer

Test: 2,4-DNPH/Brady's reagent. Observation: It produces an orange precipitate.

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Menthol and menthone, the main constituents of oil of peppermint, can be made synthetically from thymol by the following route - CIE - A-Level Chemistry - Question 3 - 2010 - Paper 1

Worked Solution & Example Answer:Menthol and menthone, the main constituents of oil of peppermint, can be made synthetically from thymol by the following route - CIE - A-Level Chemistry - Question 3 - 2010 - Paper 1

State the type of reaction of reaction I.

State the type of reaction of reaction II.

Suggest one test for thymol.

Suggest one test for menthol.

Suggest one test for menthone.

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