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8.4. Organic chemistry reaction mechanism — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry8.4. Organic chemistry reaction mechanism1 Mark
MCQ
Which compound has the highest value of $pK_a$ ?
  • A
    $Cl - CH_2 - CH_2 - COOH$
  • ✓
    $CH_3 - CH_2 -COOH$
  • C
    $\begin{array}{*{20}{c}}
      {C{H_3} - CH - COOH} \\ 
      {|\,\,\,\,\,\,\,\,\,\,\,} \\ 
      {Cl\,\,\,\,\,\,\,\,\,} 
    \end{array}$
  • D
    $\begin{array}{*{20}{c}}
      {Cl\,\,\,} \\ 
      {|\,\,\,\,\,} \\ 
      {C{H_3} - C - COOH} \\ 
      {|\,\,\,\,\,\,} \\ 
      {Cl\,\,\,\,\,} 
    \end{array}$
✓

Answer

Correct option: B.
$CH_3 - CH_2 -COOH$
b
$(b)$ Acidic strength $\propto\, - I \, \propto \, \frac{1}{+I}$

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