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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry8.4. Organic chemistry reaction mechanism1 Mark
MCQ
Which of the following carbocation is most stable?
  • A
    ${\left( {C{H_3}} \right)_3}\mathop C\limits^ +  $
  • ✓
    ${\left( {C{H_3}} \right)_3}C.\mathop C\limits^ +  {H_2}$
  • C
    $C{H_3}C{H_2}\mathop C\limits^ +  {H_2}$
  • D
    $C{H_3}\mathop C\limits^ +  HC{H_2}C{H_3}$
✓

Answer

Correct option: B.
${\left( {C{H_3}} \right)_3}C.\mathop C\limits^ +  {H_2}$
b
${\left( {C{H_3}} \right)_3}C.\mathop C\limits^ +  {H_2}$ is a tertiary carbocation. A tertiary carbocation is the most stable carbocation due to the electron releasing effect of three methyl groups. An increased $+I$ effect by three methyl groups stabilizes the positive charge on the carbocation.

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