Chemistry · General Organic Chemistry

JEE Main 2024 — 4 April, Shift 1 — Question 61

What will be the decreasing order of basic strength of the following conjugate bases ?

${ }^{-} \mathrm{OH}, \mathrm{RO}, \mathrm{CH}_{3} \mathrm{CO} \bar{O}, \mathrm{C} \overline{1}$

Option A:
$\mathrm{C} \overline{\mathrm{I}}>\mathrm{OH}>\mathrm{R} \overline{\mathrm{O}}>\mathrm{CH}_{3} \mathrm{CO} \overline{\mathrm{O}}$
Option B:
$\mathrm{R} \overline{\mathrm{O}}>{ }^{-} \mathrm{OH}>\mathrm{CH}_{3} \mathrm{CO} \overline{\mathrm{O}}>\mathrm{C} \overline{\mathrm{I}}$
Correct
Option C:
${ }^{-} \mathrm{OH}>\mathrm{R} \overline{\mathrm{O}}>\mathrm{CH}_{3} \mathrm{CO} \overline{\mathrm{O}}>\mathrm{C} \overline{1}$
Option D:
$\mathrm{C} \overline{1}>\mathrm{R} \overline{\mathrm{O}}>{ }^{-} \mathrm{OH}>\mathrm{CH}_{3} \mathrm{CO} \overline{\mathrm{O}}$

Answer: B

Strong acid have weak conjugate base Acidic strength :

$\mathrm{H}-\mathrm{Cl}>\mathrm{CH}_{3} \mathrm{COOH}>\mathrm{H}_{2} \mathrm{O}>\mathrm{R}-\mathrm{OH}$

Conjugate base strength :

$\mathrm{Cl}^{-}<\mathrm{CH}_{3} \mathrm{COO}^{-}<\overline{\mathrm{O}} \mathrm{H}<\mathrm{RO}^{-}$

Answer key and solution verified before publishing.

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