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Chemistry · General Organic Chemistry

JEE Main 2026 — 28 January, Morning Shift — Question 45

CORRECT order of stability for the following is CH2=CH−,CH3−CH2−,CH≡C−\mathrm{CH}_{2}=\mathrm{CH}^{-}, \mathrm{CH}_{3}-\mathrm{CH}_{2}^{-}, \mathrm{CH} \equiv \mathrm{C}^{-}

  1. Option A:

    CH3−CH2−>CH2=CH−>CH≡C−\mathrm{CH}_{3}-\mathrm{CH}_{2}^{-}>\mathrm{CH}_{2}=\mathrm{CH}^{-}>\mathrm{CH} \equiv \mathrm{C}^{-}

  2. Option B:

    CH2=CH−>CH≡C−>CH3−CH2−\mathrm{CH}_{2}=\mathrm{CH}^{-}>\mathrm{CH} \equiv \mathrm{C}^{-}>\mathrm{CH}_{3}-\mathrm{CH}_{2}^{-}

  3. Option C:

    CH≡C−>CH2=CH−>CH3−CH2−\mathrm{CH} \equiv \mathrm{C}^{-}>\mathrm{CH}_{2}=\mathrm{CH}^{-}>\mathrm{CH}_{3}-\mathrm{CH}_{2}^{-}

    Correct
  4. Option D:

    CH≡C−>CH3−CH2−>CH2=CH−\mathrm{CH} \equiv \mathrm{C}^{-}>\mathrm{CH}_{3}-\mathrm{CH}_{2}^{-}>\mathrm{CH}_{2}=\mathrm{CH}^{-}

Answer: C

Step-by-step solution

CH2=CH‾CH3=CH‾2CH≡C‾\mathrm{CH}_{2}=\mathrm{C} \overline{\mathrm{H}} \mathrm{CH}_{3}=\mathrm{C} \overline{\mathrm{H}}_{2} \quad \mathrm{CH} \equiv \overline{\mathrm{C}} Stability ∝% S\propto \% \mathrm{~S} Order of stability CH≡C‾>CH2=CH‾>CH3−CH‾2\mathrm{CH} \equiv \overline{\mathrm{C}}>\mathrm{CH}_{2}=\mathrm{C} \overline{\mathrm{H}}>\mathrm{CH}_{3}-\mathrm{C} \overline{\mathrm{H}}_{2}

Answer key and solution verified before publishing.

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Exam
JEE Main 2026
Paper
28 January, Morning Shift
Subject
Chemistry
Chapter
General Organic Chemistry
Topic
Other applications of electronic effects