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Chemistry · PYQ NEET UG 2025

हिन्दी

Among the given compounds I-III, the correct order of bond dissociation energy of C-H bond marked with * is :

  1. \( \text{II} > \text{I} > \text{III} \)
  2. \( \text{I} > \text{II} > \text{III} \)
  3. \( \text{III} > \text{II} > \text{I} \)
  4. \( \text{II} > \text{III} > \text{I} \)

Correct answer · Option 1

\( \text{II} > \text{I} > \text{III} \)

Explanation

Bond dissociation energy depends on the stability of the free radical formed. Compound III is cyclopropene (allylic/strained \( sp^3 \) carbon forming antiaromatic/strained radical), II is \( \text{sp} \) hybridized \( \text{C}-\text{H} \) bond in phenylacetylene derivative (very high BDE), I is benzylic \( ext{C}- ext{H} \). Stability order gives bond dissociation energy order: \( \text{II} > \text{I} > \text{III} \).
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