Q. Which will give turbidity fastest on reaction with Lucas reagent ?

1548 216 UP CPMTUP CPMT 2009 Report Error

A

$C H_{3} C H_{2} O H$

B

Option 2 Image

C

Option 3 Image

D

$C H_{3} C H_{2} C H_{2} O H$

Solution:

Lucas test: A lcohols react w ith concentrated hydrochloric acid in presence of anhydrous zinc chloride to form alkyl halides
$R - O H + H C I Zncl X_{2} Alkyl halide R - Cl + H_{2} O$
The three types of alcohols undergo this reaction at different rates. The rates of reaction with Lucas reagent, [conc. $H Cl + Z n C l_{2}$ (anhydrous)) follow the order : $3^{\circ} > 2^{\circ} > 1^{\circ}$