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JIPMER 2004
Exam
JIPMER
Year
2004
Subject
Chemistry
Chapter
General Organic Chemistry

JIPMER 2004 · Chemistry · General Organic Chemistry

The correct order of stability of carbocations, is :

The correct order of stability of carbocations, is :

Options

  1. A1∘<2∘<3∘<C+H31^{\circ} \lt 2^{\circ} \lt 3^{\circ} \lt \stackrel{+}{\mathrm{C}} \mathrm{H}_3
  2. BC+H3<1∘<2∘<3∘\stackrel{+}{\mathrm{C}} \mathrm{H}_3 \lt 1^{\circ} \lt 2^{\circ} \lt 3^{\circ}
  3. C3∘<2∘<1∘<C+H33^{\circ} \lt 2^{\circ} \lt 1^{\circ} \lt \stackrel{+}{\mathrm{C}} \mathrm{H}_3
  4. D2∘<3∘<1∘<C+H32^{\circ} \lt 3^{\circ} \lt 1^{\circ} \lt \stackrel{+}{\mathrm{C}} \mathrm{H}_3

Correct answer

B. C+H3<1∘<2∘<3∘\stackrel{+}{\mathrm{C}} \mathrm{H}_3 \lt 1^{\circ} \lt 2^{\circ} \lt 3^{\circ}

Step-by-step solution

More the +I alkyl groups on electron deficient carbon, more stable will be the cabocation. Hence, 3∘3^{\circ} carbocations are more stable. The correct order is 3∘>2∘>1∘>CH3+3^{\circ}\gt2^{\circ}\gt1^{\circ}\gt\mathrm{CH}_3^+
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