Chemical Test to Distinguish Between Propan-2-ol and Ethanol
Propan-2-ol and ethanol are two common alcohols that can be distinguished using a simple chemical test. Here is a test that can help differentiate between the two:

Lucas Test
The Lucas test is a qualitative test used to distinguish between primary, secondary, and tertiary alcohols. In this test, Lucas reagent (a mixture of concentrated hydrochloric acid and zinc chloride) is added to the alcohol sample.

Procedure:
1. Take two test tubes and add a small amount of the alcohol sample in each.
2. To one test tube, add a few drops of Lucas reagent.
3. Shake the test tube gently and observe the result.

Observations:
- If the alcohol is propan-2-ol (a secondary alcohol), a cloudy solution will form immediately.
- If the alcohol is ethanol (a primary alcohol), no cloudiness will be observed even after a few minutes.

Explanation:
The Lucas test relies on the difference in reactivity between primary, secondary, and tertiary alcohols with Lucas reagent. Tertiary alcohols react rapidly to form a cloudy solution, secondary alcohols react slower forming a cloudy solution, and primary alcohols do not react at all with Lucas reagent.
By performing the Lucas test, one can easily differentiate between propan-2-ol and ethanol based on their reactivity with the reagent.