Out of all the cycloalkanes, which one has the most ring strain and which one is strain free?

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Understand the Problem

The question is asking which cycloalkane has the highest ring strain and which one is considered strain-free. It presents multiple choices that outline the ring strain characteristics of different cycloalkanes.

Answer

B. Cyclopropane - ring strain; Cyclohexane (chair) - strain-free.

The final answer is B. Cyclopropane has the most ring strain, and cyclohexane (chair conformation) is strain-free.

Answer for screen readers

The final answer is B. Cyclopropane has the most ring strain, and cyclohexane (chair conformation) is strain-free.

More Information

Cyclopropane's small bond angle of 60º creates significant angle strain. Cyclohexane in the chair conformation minimizes ring strain with bond angles close to 109.5º.

Tips

A common mistake is confusing cyclopentane as strain-free due to its near 108º angles, but cyclohexane achieves a more ideal strain-free conformation.

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