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ChemistryNEET 2025Reaction intermediates and types of reactions

Organic Chemistry: Some Basic Principles and Techniques

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

Question 76 as printed in the NEET 2025 booklet

  1. A.II > I > III✓
  2. B.I > II > III
  3. C.III > II > I
  4. D.II > III > I

Solution

Bond strength rises with the -character of the carbon orbital. The terminal alkyne C–H (II, ) is strongest, then the aromatic C–H (I, ), then the cyclopropane C–H (III, roughly but weaker than aryl). II > I > III.

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