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JEE Main 20244 AprilMorning Shift
Exam
JEE Main
Year
2024
Date
4 April
Shift
Morning Shift
Subject
Chemistry
Chapter
d and f Block Elements

JEE Main 2024 · 4 April · Morning Shift · Chemistry · d and f Block Elements

What will be the decreasing order of basic strength of the...

What will be the decreasing order of basic strength of the following conjugate bases? ({ }^{-} \mathrm{OH}, \mathrm{R} \overline{\mathrm{O}}, \mathrm{CH}_3 \mathrm{CO} \overline{\mathrm{O}}, \mathrm{C} \overline{I\mathrm{I}})

Options

  1. A(\mathrm{R} \overline{\mathrm{O}}>{ }^{-} \mathrm{OH}>\mathrm{CH}_3 \mathrm{CO} \overline{\mathrm{O}}>\mathrm{C} \overline{I\mathrm{I}})
  2. B(\mathrm{C} \overline{\mathrm{l}}>\mathrm{R} \overline{\mathrm{O}}>{ }^{-} \mathrm{OH}>\mathrm{CH}_3 \mathrm{CO} \overline{\mathrm{O}})
  3. C({ }^{-} \mathrm{OH}>\mathrm{R} \overline{\mathrm{O}}>\mathrm{CH}_3 \mathrm{CO} \overline{\mathrm{O}}>\mathrm{C} \overline{1})
  4. D(\mathrm{C} \overline{I\mathrm{I}}>{ }^{-} \mathrm{OH}>\mathrm{R} \overline{\mathrm{O}}>\mathrm{CH}_3 \mathrm{CO} \overline{\mathrm{O}})

Correct answer

A. (\mathrm{R} \overline{\mathrm{O}}>{ }^{-} \mathrm{OH}>\mathrm{CH}_3 \mathrm{CO} \overline{\mathrm{O}}>\mathrm{C} \overline{I\mathrm{I}})

Step-by-step solution

Strong acid have weak conjugate base Acidic strength : H−Cl>CH3COOH>H2O>R−OH\mathrm{H}-\mathrm{Cl}>\mathrm{CH}_3 \mathrm{COOH}>\mathrm{H}_2 \mathrm{O}>\mathrm{R}-\mathrm{OH}
Conjugate base strength : Cl−<CH3COO−<O‾H<RO−\mathrm{Cl}^{-} < \mathrm{CH}_3 \mathrm{COO}^{-} < \overline{\mathrm{O}} \mathrm{H} < \mathrm{RO}^{-}
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