Lucas test is used to distinguish 1°, 2° and 3° alcohols. Which one of the following does not give any turbidity with Lucas reagent (HCl + anhydrous ${ZnCl}_{2}$ ) at room temperature.

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Iso amyl alcohol

Iso propyl alcohol

2-butanol

2-methyl-2-propanol

answer is A.

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Detailed Solution

Alcohol	Lucas test
1° alcohol	No turbidity at room temperature
2° alcohol	Turbidity in few minutes
3° alcohol	Immediate turbidity

Iso amyl(pentyl) alcohol - ${({CH}_{3})}_{2} CH - {CH}_{2} - {CH}_{2} OH . . . 1^{0}$

Iso propyl alcohol- ${({CH}_{3})}_{2} CHOH . . . 2^{0}$

2-butanol- ${CH}_{3} - CH (OH) - {CH}_{2} - {CH}_{3} . . . 2^{0}$

2-methyl-2-propanol- ${({CH}_{3})}_{3} C - OH . . . 3^{0}$

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