Question

Which of the following tests is positive for the given compound [A]? 

• A. Br2 water test
• B. Tollen’s test
• C. Victor Meyer test
• D. Lucas test

Hint:

Lucas test is used to distinguish alcohols based on their reactivity with ZnCl\textsubscript{2}/HCl. Tertiary alcohols react immediately, forming a cloudy solution, while secondary and primary alcohols react slowly or not at all.

Answer 1

The Correct Option is D

Step 1: Structure Analysis. The compound features a hydroxyl (-OH) group attached to a tertiary carbon within a cyclic system, indicating a tertiary alcohol.
Step 2: Test Analysis.
- Bromine water test (\(Br_{2}\) water): Detects unsaturation or phenols. The compound lacks these functional groups.
- Tollen's test: Identifies aldehydes and alpha-hydroxy ketones. The compound is neither.
- Victor Meyer test: Differentiates primary, secondary, and tertiary alcohols, but does not confirm tertiary alcohols directly.
- Lucas test: Distinguishes primary, secondary, and tertiary alcohols. Tertiary alcohols react instantaneously, making this test appropriate.
Step 3: Test Selection. As a tertiary alcohol, the compound will react immediately with Lucas reagent (\(ZnCl_{2}/HCl\)), producing a cloudy alkyl chloride solution.

Final Answer: The compound yields a positive Lucas test, verifying its tertiary alcohol nature.