See image — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

**Solution:** The C-C single bond energy is a fundamental property in organic chemistry. **Key Points:** 1. **Bond energy definition**: The energy required to break one mole of bonds in the gaseous state, expressed in $\text{kcal mol}^{-1}$. 2. **Typical C-C single bond energy**: The C-C single bond is one of the strongest single bonds in organic molecules, with an established value of approximately **85-100 kcal/mol**. 3. **Comparison with other bonds**: - C-H bond: ~98 kcal/mol - C-C single bond: ~85 kcal/mol - C=C double bond: ~146 kcal/mol 4. **Eliminating wrong options**: - (A) 1 kcal/mol: Far too low (would imply trivial bond strength) - (B) 10 kcal/mol: Still too low (weaker than hydrogen bonds) - (D) 1000 kcal/mol: Unrealistically high (comparable to breaking multiple bonds) 5. **Why (C) is correct**: 100 kcal/mol falls within the experimentally established range (85-100 kcal/mol) for C-C single bonds, making it the most reasonable answer. **Answer: (C) 100**