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Basics of Organic Chemistry question

2025 · 24 Jan · Shift 1 · Q7
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Basics of Organic Chemistry question

2025 · 24 Jan · Shift 1 · Q7

JEE MainChemistryBasics of Organic ChemistryMCQ+4 / −1
Which one of the carbocations from the following is most stable?
  1. A
    JEE Main 2025 (Online) 24th January Morning Shift Chemistry - Basics of Organic Chemistry Question 22 English Option 1
  2. B
    JEE Main 2025 (Online) 24th January Morning Shift Chemistry - Basics of Organic Chemistry Question 22 English Option 2
  3. C
    JEE Main 2025 (Online) 24th January Morning Shift Chemistry - Basics of Organic Chemistry Question 22 English Option 3
  4. D
    JEE Main 2025 (Online) 24th January Morning Shift Chemistry - Basics of Organic Chemistry Question 22 English Option 4
View written solutionFree

Correct answer: QUESTION INCOMPLETE: PLEASE PROVIDE THE CARBOCATION STRUCTURES FOR OPTIONS A, B, C, AND D.

The question asks: Which carbocation is most stable?

However, the structures corresponding to options A, B, C, D are missing in the provided prompt. Since carbocation stability depends completely on the specific structure, we cannot determine the correct option from the information given.

1. What determines carbocation stability?

Carbocation stability generally depends on:

  1. Resonance stabilization
  2. Hyperconjugation
  3. Inductive effects
  4. Aromatic stabilization, if applicable
  5. Hybridization / neighboring group participation in special cases

Typical order in many simple cases is:

benzylic / allylic with resonance>3∘>2∘>1∘>methyl\text{benzylic / allylic with resonance} > 3^\circ > 2^\circ > 1^\circ > \text{methyl}benzylic / allylic with resonance>3∘>2∘>1∘>methyl

But this order can change if special resonance or aromatic stabilization is present.

2. Why the answer cannot be uniquely determined

Since the actual carbocation structures for A, B, C, and D are not shown, there is no way to compare:

  • degree of substitution,
  • resonance,
  • allylic/benzylic character,
  • aromaticity,
  • rearrangement tendencies.

Therefore, the problem is incomplete as given.

3. Comparison with stored answer

The stored correct answer is C, but because the options are absent, I cannot verify whether C is truly correct.

So I must disagree with the stored answer on the basis of insufficient data, not because C is definitely wrong.

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