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  4. Alcohol + Lucas reagent overset arrow Immediate turbidity How many of the following will give above test positive? 2- Methylpropan -2- ol, butan -1- ol, 2- methylpropan -1- ol, 2,2- dimethylpropan -1- ol, 2,4- dimethylpentan -2- ol, propan- 1,3- diol

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Q. Alcohol $+$ Lucas reagent $\overset{}{ \rightarrow }$ Immediate turbidity
How many of the following will give above test positive?
$2-$ Methylpropan $-2-$ ol, butan $-1-$ ol, $2-$ methylpropan $-1-$ ol, $2,2-$ dimethylpropan $-1-$ ol, $2,4-$ dimethylpentan $-2-$ ol, propan- $1,3-$ diol

NTA AbhyasNTA Abhyas 2022

Solution:

Tertiary alcohols like $2$ -methylpropan- $2$ -ol, $2,4$ -dimethylpentan- $2$ -ol react immediately with Lucas reagent $\left(\right.$ conc. $HCl +$ anhydrous $\left.ZnCl _2\right)$ at room temperature.