JEE Main · 2021 · Shift-ImediumGOC-085

Resonance stabilized carbocations among given species are:

General Organic Chemistry (GOC) · Class 11 · JEE Main Previous Year Question

Question

Resonance stabilized carbocations among given species are: image

Options
  1. a

    (A), (B) and (C) only

  2. b

    (C) and (D) only

  3. c

    (A), (B) and (D) only

  4. d

    (A) and (B) only

Correct Answerd

(A) and (B) only

Detailed Solution

Step 1: Checking for Conjugation Resonance stabilization occurs when a positive charge is adjacent to a double bond or a lone pair.

  • (A) Benzyl Cation: Stabilized by the phenyl ring resonance.
  • (B) Allyl Cation: Stabilized by one double bond.
  • (C) Cyclic Non-conjugated: The charge is not adjacent to the double bond.
  • (D) Vinyl carbocation: The carbon double bond is not in conjugation with the carbonyl group.

Step 2: Conclusion (A) and (B) are resonance-stabilized.

Answer: (d) (A) and (B) only\boxed{\text{Answer: (d) (A) and (B) only}}

Here is the complete list of carbocation stability based on real data from reputed organic book.

image

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