Question

Which of the following compounds reacts immediately with Lucas reagent?

• A. $CH_3CH_2OH$
• B. $CH_3CH_2CH_2OH$
• C.
• D.

Answer 1

Answer: (D)

Answer 2

Lucas reagent is used to distinguish primary, secondary or tertiary alcohols. Alcohols are soluble in Lucas reagent while their halides are immiscible and produce turbidity in solution.

In case of tertiary alcohols, turbidity is produced immediately as they form the halides easily. Primary alcohols do not produce turbidity at room temperature.

(a) $\underset{(1^{\circ})}{CH _{3} CH _{2} OH} { ->[{\text{Conc. Hcl +}}][{\text{anhy}} Zncl_2]}$ No reaction
(b) $\underset{(1^{\circ})}{CH _{3} CH _{2} OH} { ->[{\text{Conc. Hcl +}}][{\text{anhy}} Zncl_2]}$ No reaction