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Thermodynamics question

2010 · Shift 1 · Q9
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Thermodynamics question

2010 · Shift 1 · Q9

JEE AdvancedChemistryThermodynamicsMCQ+1 / −0.25
The bond energy (in kcal mol-1) of a C−CC-CC−C single bond is approximately
  1. A
    1
  2. B
    10
  3. C
    100
  4. D
    1000
View written solutionFree

Correct answer: C

  1. Recall the typical bond energy of a C−CC-CC−C single bond

    The bond dissociation energy of a carbon-carbon single bond is approximately: ≈80 to 90 kcal mol−1\approx 80\text{ to }90\ \text{kcal mol}^{-1}≈80 to 90 kcal mol−1

    A commonly used approximate value is around: ≈83 kcal mol−1\approx 83\ \text{kcal mol}^{-1}≈83 kcal mol−1

  2. Compare with the given options

    • A: 111 kcal mol−1^{-1}−1 → far too small
    • B: 101010 kcal mol−1^{-1}−1 → still too small
    • C: 100100100 kcal mol−1^{-1}−1 → closest approximate value
    • D: 100010001000 kcal mol−1^{-1}−1 → far too large

  3. Conclusion

    Since the actual value is of the order of 10210^2102 kcal mol−1^{-1}−1, the best approximate answer is: 100 kcal mol−1\boxed{100\ \text{kcal mol}^{-1}}100 kcal mol−1​

Therefore, the correct option is C.

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