Assertion : Phenol is a stronger acid than et | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) Phenol $(C_6H_5OH)$ is a stronger acid than ethanol $(C_2H_5OH)$ because the phenoxide ion $(C_6H_5O^-)$ formed after the loss of a proton is reso

Vedclass · Accepted Answer

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

Vedclass · Answer

(B) Phenol $(C_6H_5OH)$ is a stronger acid than ethanol $(C_2H_5OH)$ because the phenoxide ion $(C_6H_5O^-)$ formed after the loss of a proton is resonance-stabilized,whereas the ethoxide ion $(C_2H_5O^-)$ is not.Groups with $+M$ effect (like $-OH$,$-OR$,$-NH_2$) increase electron density in the ring,which destabilizes the phenoxide ion and decreases the acidity of phenols when present at the $p-$position.Both the Assertion and the Reason are scientifically correct statements,but the Reason does not explain why phenol is a stronger acid than ethanol.Therefore,the correct option is $(b)$.

Assertion : Phenol is a stronger acid than ethanol.
Reason : Groups with $+M$ effect decrease acidity at $p-$position.

Similar Questions

The Reimer-Tiemann reaction involves a

Phenol condenses with phthalic anhydride in the presence of conc. $H_2SO_4$ to form:

The product$(s)$ of the reaction is/are:

Which of the following is the weakest acid?

$C_6H_6 + X \xrightarrow{anhydrous AlCl_3} \text{Isopropylbenzene} \xrightarrow{(i) O_2, (ii) H^+} Y + Z$. In this reaction, $X, Y$ and $Z$ are . . . . . . respectively.

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Assertion : Phenol is a stronger acid than ethanol.Reason : Groups with $+M$ effect decrease acidity at $p-$position.