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: Understanding the given structure. The given compound contains a hydroxyl (-OH) group attached to a tertiary carbon in a cyclic structure. This suggests the presence of a tertiary alcohol. 
Step 2: Understanding the given tests. - \(Br_{2}\) water test: Used to detect unsaturation (double bonds) or phenols. The given compound does not contain a double bond or a phenol group.
- Tollen’s test: Used to detect aldehydes and alpha-hydroxy ketones. The given compound is not an aldehyde or an alpha-hydroxy ketone.
- Victor Meyer test: Used to distinguish between primary, secondary, and tertiary alcohols, but it does not confirm the presence of a tertiary alcohol directly.
- Lucas test: Used to differentiate between primary, secondary, and tertiary alcohols. Since tertiary alcohols react immediately, this test is suitable for the given compound. 
Step 3: Identifying the correct test. Since the compound is a tertiary alcohol, it reacts instantly with Lucas reagent (\(ZnCl_{2}/HCl)\), forming a cloudy solution due to the formation of an alkyl chloride. 

Final Answer: The given compound gives a positive Lucas test, confirming the presence of a tertiary alcohol.