Q41 / 150 · MHT CET 2026 (17 April Shift 1) · Chemistry
Identify ' Z' in the following reaction.
- A$\text{Ar} - \text{O} - \text{R}$
- B
- Correct answerC
- D
Solution
The given reaction is an esterification reaction where a phenol ($\text{Ar-OH}$) reacts with an acid chloride ($\text{R-COCl}$) in the presence of a base like pyridine.
In this nucleophilic acyl substitution reaction, the oxygen atom of the phenol acts as a nucleophile and attacks the electrophilic carbonyl carbon of the acid chloride.
Pyridine is used as a base to neutralize the $\text{HCl}$ formed during the reaction, which prevents the backward reaction and drives the equilibrium in the forward direction.
The reaction proceeds as follows:
$\text{Ar-OH} + \text{R-CO-Cl} \xrightarrow{\text{Pyridine}} \text{R-CO-O-Ar} + \text{HCl}$
The product 'Z' formed is an aryl ester, which has the structure $\text{R-C(=O)-O-Ar}$.
Answer:
In this nucleophilic acyl substitution reaction, the oxygen atom of the phenol acts as a nucleophile and attacks the electrophilic carbonyl carbon of the acid chloride.
Pyridine is used as a base to neutralize the $\text{HCl}$ formed during the reaction, which prevents the backward reaction and drives the equilibrium in the forward direction.
The reaction proceeds as follows:
$\text{Ar-OH} + \text{R-CO-Cl} \xrightarrow{\text{Pyridine}} \text{R-CO-O-Ar} + \text{HCl}$
The product 'Z' formed is an aryl ester, which has the structure $\text{R-C(=O)-O-Ar}$.
Answer:
Hence, the correct answer is option: 'C'.