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  4. In Lucas test an alcohol react immediately and gives insoluble chloride. The alcohol is

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Q. In Lucas test an alcohol react immediately and gives insoluble chloride. The alcohol is

Haryana PMTHaryana PMT 2010Alcohols Phenols and Ethers

Solution:

In Lucas test, alcohol reacts with cone. $H C l$ in anhy $Z n C l_{2}$ and convert into alkyl halide, which is insoluble in water and their appearance is indicated by the appearance of turbidity.
Since, the order of reactivity of alcohol is tertiary $>$ secondary $>$ primary
Hence, the Lucas test is immediately given by tertiary alcohol, ie, $\left( CH _{3}\right)_{3} COH$.