The compound which produce turbidity immediately with Lucas reagent is

$(CH_3)_3C-OH$

The correct answer is Option (1) → $(CH_3)_3C-OH$

Lucas reagent (conc. HCl + ZnCl₂) is used to distinguish between primary, secondary and tertiary alcohols. Reaction occurs via carbocation formation.

Reactivity order: Tertiary alcohol > Secondary alcohol > Primary alcohol

Tertiary alcohols form stable carbocations and react immediately, producing turbidity instantly.

Secondary alcohols react slowly.

Primary alcohols show no turbidity at room temperature.

Phenols do not react.

Option 1: (CH₃)₃C–OH Tertiary alcohol Forms stable carbocation Produces turbidity immediately Correct

Option 2: (CH₃)₂CH–OH Secondary alcohol Turbidity appears after some time

Option 3: C₆H₅OH Phenol Does not react with Lucas reagent

Option 4: CH₃CH₂–OH Primary alcohol No turbidity at room temperature