Question:
Consider the following carbocations: (I) $(CH_3)_2CH-CH_2^+$, (II) $CH_2=CH-C^+H-CH_3$, (III) $(CH_3)_2CH-C^+H-CH_3$. The correct order of stabilities of these is:
Consider the following carbocations: (I) $(CH_3)_2CH-CH_2^+$, (II) $CH_2=CH-C^+H-CH_3$, (III) $(CH_3)_2CH-C^+H-CH_3$. The correct order of stabilities of these is:
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Resonance-stabilized carbocations are always more stable than simple alkyl carbocations.
Updated On: Jun 6, 2026
- I < III < II
- I < II < III
- III < II < I
- III < I < II
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The Correct Option is A
Solution and Explanation
Step 1: Concept
Stability of carbocations: Resonance > Hyperconjugation > Inductive Effect.
Step 2: Meaning
Compare stabilization factors (resonance vs. alkyl groups).
Step 3: Analysis
I is a primary carbocation ($1^{\circ}$, less stable). III is a secondary carbocation ($2^{\circ}$, more stable). II is an allylic carbocation (stabilized by resonance, most stable). Order: $1^{\circ} < 2^{\circ} < \text{Allylic}$.
Step 4: Conclusion
Stability order is I < III < II.
Final Answer: (A)
Stability of carbocations: Resonance > Hyperconjugation > Inductive Effect.
Step 2: Meaning
Compare stabilization factors (resonance vs. alkyl groups).
Step 3: Analysis
I is a primary carbocation ($1^{\circ}$, less stable). III is a secondary carbocation ($2^{\circ}$, more stable). II is an allylic carbocation (stabilized by resonance, most stable). Order: $1^{\circ} < 2^{\circ} < \text{Allylic}$.
Step 4: Conclusion
Stability order is I < III < II.
Final Answer: (A)
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