Match List-I with List-II
|
List-I |
List-II |
|
(A) Kolbe's reaction |
(I) Preparation of symmetrical and unsymmetrical ethers |
|
(B) Williamson synthesis |
(II) Preparation of Salicylic acid |
|
(C) Lucas test |
(III) Organo-Magnesium halide |
|
(D) Grignard's reagent |
(IV) Distinction between different types of alcohols |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
|
List-I |
List-II |
|
(A) Kolbe's reaction |
(II) Preparation of Salicylic acid |
|
(B) Williamson synthesis |
(I) Preparation of symmetrical and unsymmetrical ethers |
|
(C) Lucas test |
(IV) Distinction between different types of alcohols |
|
(D) Grignard's reagent |
(III) Organo-Magnesium halide |
The Breakdown
(A) Kolbe's Reaction → (II) Preparation of Salicylic acid
In this reaction, phenol is treated with sodium hydroxide and then carbon dioxide ($CO_2$) under pressure, followed by acidification to produce salicylic acid (a key step in making aspirin).
(B) Williamson synthesis → (I) Preparation of symmetrical and unsymmetrical ethers
This is an $S_N2$ reaction where an organohalide reacts with a deprotonated alcohol (alkoxide) to form an ether. It is the go-to method for creating ethers with different or identical R-groups.
(C) Lucas test→ (IV) Distinction between different types of alcohols
The Lucas reagent (anhydrous $ZnCl_2$ and conc. $HCl$) is used to tell primary, secondary. and tertiary alcohols apart based on how quickly the solution turns turbid.
- Tertiary: Immediate turbidity.
- Secondary: Turbidity within 5 minutes.
- Primary: No turbidity at room temperature.
(D) Grignard's reagent → (III) Organo-Magnesium halide
A Grignard reagent has the general formula $R-Mg-X$, where $R$. is an alkyl or aryl group and $X$ is a halogen. It is a fundamental tool for forming new carbon-carbon bonds.