Which cycloalkane has the lowest heat of combustion per $CH_{2$ group?
Show Hint
- Cyclopropane
- Cyclobutane
- Cyclopentane
- Cyclohexane
The Correct Option is D
Solution and Explanation
Heat of combustion per $CH_{2}$ group is a measure of the chemical stability of cycloalkanes.
Step 2: Analysis
Stability increases as angle strain decreases. Cyclohexane is virtually strain-free.
Step 3: Conclusion
Because it is the most stable, cyclohexane has the lowest heat of combustion per $CH_{2}$ group.
Final Answer: (D)
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