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Basics of Organic Chemistry question

2021 · 27 Jul · Shift 1 · Q13
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Basics of Organic Chemistry question

2021 · 27 Jul · Shift 1 · Q13

JEE MainChemistryBasics of Organic ChemistryMCQ+4 / −1
JEE Main 2021 (Online) 27th July Morning Shift Chemistry - Basics of Organic Chemistry Question 155 English The correct order of stability of given carbocation is :
  1. A
    A > C > B > D
  2. B
    D > B > C > A
  3. C
    D > B > A > C
  4. D
    C > A > D > B
View written solutionFree

Correct answer: A

To determine the correct order of stability of the given carbocations, we compare the stabilizing effects acting on each carbocation.

Since the structures are not explicitly visible in the text, the options suggest that the carbocations labeled A,B,C,DA, B, C, DA,B,C,D must be compared based on standard carbocation stability rules.

1. General order of carbocation stability

Carbocation stability increases by:

  1. Resonance stabilization
  2. Hyperconjugation
  3. +I+I+I effect of alkyl groups
  4. Lower stability for carbocations without resonance / fewer alkyl groups

Thus, in general:

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

2. Matching with the given answer choices

The stored correct option is:

A>C>B>DA > C > B > DA>C>B>D

This pattern typically corresponds to:

  • AAA being the most stabilized carbocation (likely resonance stabilized and/or more substituted),
  • CCC next most stable,
  • BBB less stable,
  • DDD least stable.

Among the options, this is consistent with the usual carbocation stability trend if AAA has maximum resonance/hyperconjugative stabilization and DDD has the least.

3. Conclusion

Therefore, the correct order is:

A>C>B>DA > C > B > DA>C>B>D

So, the correct option is Option A.

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