1. Tardigrade
  2. Question
  3. Chemistry
  4. Lucas reagent will give instant turbidity with:

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. Lucas reagent will give instant turbidity with:

VMMC MedicalVMMC Medical 2002

Solution:

Lucas reagent is a mixture of anhy. $ ZnC{{l}_{2}} $ and cone. $ \text{HCl}\text{.} $ It is used to distinguish the primary, secondary and tertiary alcohols. $ \underset{(Tertiary\,alcohol)}{\mathop{R-\underset{R}{\overset{R}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,OH+HCl}}\,\xrightarrow[\text{at}\,\text{room}\,\text{temp}\text{.}]{\text{anhy}\text{.ZnC}{{\text{l}}_{\text{2}}}} $ $ R-\underset{R}{\overset{R}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-Cl+\underset{(water)}{\mathop{{{H}_{2}}O}}\,\left[ \begin{align} & \text{while} \\ & \text{turbidity} \\ & \text{immediately} \\ \end{align} \right] $ Secondary alcohols give white turbidity within 1-2 minute and primary alcohols give white turbidity only on heating.