Given below are two statements: One is labelled as Assertion A an… - Vidyadip

MCQ

Given below are two statements: One is labelled as $A$ssertion $A$ and the other is labelled as $R$eason $R$:

Assertion $A$: $\mathrm{pK}_{\mathrm{a}}$ value of phenol is $10.0$ while that of ethanol is $15.9$.

Reason $R$: Ethanol is stronger acid than phenol.In the light of the above statements, choose the correct answer from the options given below:

✓
$A$ is true but $R$ is false.
B
A is false but $R$ is true.
C
Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.
D
Both $A$ and $R$ are true but $R$ is $NOT$ the correct explanation of $A$.

✓

Answer

Correct option: A.

$A$ is true but $R$ is false.

a
Phenol is more acidic than ethanol because conjugate base of phenoxide is more stable than ethoxide.

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