Question:
Lucas reagent is
Lucas reagent is
Show Hint
The Lucas test is based on the formation of an insoluble alkyl chloride layer.
Updated On: Apr 24, 2026
- Con. HNO\(_3\) + ZnCl\(_2\)
- Con. HCl + ZnCl\(_2\)
- Con. H\(_2\)SO\(_4\) + ZnCl\(_2\)
- Acetic acid + ZnCl\(_2\)
- Oleium + ZnCl\(_2\)
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Lucas reagent is a chemical test used to distinguish between primary, secondary, and tertiary alcohols.
Step 2: Detailed Explanation:
Lucas reagent is a solution of anhydrous zinc chloride (ZnCl2) in concentrated hydrochloric acid (HCl). It reacts with alcohols to form alkyl chlorides. The rate of reaction is: tertiary > secondary > primary. Tertiary alcohols react immediately, secondary alcohols react within a few minutes, and primary alcohols react very slowly or not at all at room temperature.
Step 3: Final Answer:
Lucas reagent is conc. HCl + ZnCl2.
Lucas reagent is a chemical test used to distinguish between primary, secondary, and tertiary alcohols.
Step 2: Detailed Explanation:
Lucas reagent is a solution of anhydrous zinc chloride (ZnCl2) in concentrated hydrochloric acid (HCl). It reacts with alcohols to form alkyl chlorides. The rate of reaction is: tertiary > secondary > primary. Tertiary alcohols react immediately, secondary alcohols react within a few minutes, and primary alcohols react very slowly or not at all at room temperature.
Step 3: Final Answer:
Lucas reagent is conc. HCl + ZnCl2.
Was this answer helpful?
0
0
Top KEAM Chemistry Questions
- The pH of a solution obtained by mixing 60 mL of 0.1 M BaOH solution at 40m of 0.15m HCI solution is
- $4\, g$ of copper was dissolved in concentrated nitric acid. The copper nitrate solution on strong heating gave $5\, g$ of its oxide. The equivalent weight of copper is :
- Green chemistry deals with
- Neopentyl bromide undergoes dehydrohalogenation to give alkenes even though it has no $\beta$- hydrogen. This is due to
- Plot of $ log\text{ }x/m $ against log $p$ is a straight line inclined at an angle of $ 45{}^\circ $ . When the pressure is $ 0.5 \,arm $ and Freundlich parameter. $ k $ is $ 10 $ , the amount of solute adsorbed per gram of adsorbent will be $ (log\text{ }5=0.6990) $
View More Questions
Top KEAM Alcohols, Phenols and Ethers Questions
- Williamson?? synthesis of preparing dimethyl ether is a/an
- Phenol can be converted to o-hydroxybenzaldehyde by
- From the following, choose the correct structures of chloroxylenol and terpineol, which are the constituents of "Dettol"
- Which of the following aryl chlorides on warming with water forms the corresponding phenol?
- Resorcinol is
View More Questions
Top KEAM Questions
- i.$\quad$ They help in respiration ii.$\quad$ They help in cell wall formation iii.$\quad$ They help in DNA replication iv. $\quad$They increase surface area of plasma membrane Which of the following prokaryotic structures has all the above roles?
- A body oscillates with SHM according to the equation (in SI units), $x = 5 cos \left(2\pi t +\frac{\pi}{4}\right) .$ Its instantaneous displacement at $t = 1$ second is
- The pH of a solution obtained by mixing 60 mL of 0.1 M BaOH solution at 40m of 0.15m HCI solution is
Kepler's second law (law of areas) of planetary motion leads to law of conservation of
- If $\int e^{2x}f' \left(x\right)dx =g \left(x\right)$, then $ \int\left(e^{2x}f\left(x\right) + e^{2x} f' \left(x\right)\right)dx =$
View More Questions