TS EAMCET · Chemistry · Alcohols Phenols and Ethers

Which of following alcohols gives white turbidity almost immediately with the Lucas reagent at room temperature? (i) $n$ -Butanol (ii) tertiary-Butanol (iii) Benzyl alcohol (iv) Allylic alcohol

A (i), (ii) and (iii)
B (i), (iii) and (iv)
C (ii), (iii) and (iv)
D (i), (ii) and (iv)

Verified Solution

Answer & Solution

Correct Answer

(C) (ii), (iii) and (iv)

Step-by-step Solution

Detailed explanation

The reagent used in Lucas test are conc. HCl+ZnCl2. It gives the white turbidity or cloudiness with alcohols. It is used to distinguish between primary, secondary and tertiary alcohol. Primary alcohol give the white turbidity in 30 min. Secondary alcohol give the white turbidity…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Which of following alcohols gives white turbidity almost immediately with the Lucas reagent at room temperature? (i) n-Butanol (ii) tertiary-Butanol (iii) Benzyl alcohol (iv) Allylic alcohol

Step-by-step Solution

Which of following alcohols gives white turbidity almost immediately with the Lucas reagent at room temperature? (i) $n$ -Butanol (ii) tertiary-Butanol (iii) Benzyl alcohol (iv) Allylic alcohol