Question

Which of the following compounds reacts immediately with Lucas reagent?

• A. $C{H}_{3}C{H}_{2}OH$
• B. $C{H}_{3}C{H}_{2}C{H}_{2}OH$
• C. $C{H}_3-\underset{OH}{\underset{|}{C}}H-C{H}_3$
• D. $C{H}_3-\stackrel{C{H}_3}{\stackrel{|}{\underset{OH}{\underset{|}{C}}}}-C{H}_3$

Answer 1

Answer: (D)

$C{H}_3-\stackrel{C{H}_3}{\stackrel{|}{\underset{OH}{\underset{|}{C}}}}-C{H}_3$

Lucas reagent is a solution of anhydrous zinc chloride in concentrated hydrochloric acid. This solution is used to classify alcohols of low molecular weight. The reaction is a substitution in which the chloride replaces a hydroxyl group.

With lucas reagent, tertiary alcohols react almost immediately as they form tertiary carbocations which are the most stable. Turbidity is observed in seconds.

So, the correct answer is option D.