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What is the order from most strained to least strained?

A. Cyclopropane
B. Cyclobutane
C. Cyclopentane
D. Cyclohexane
E. Cycloheptane

Answer :

Final answer:

The order from most to least strained cycloalkanes is cyclopropane, cyclobutane, cyclopentane, cyclohexane, and cycloheptane, with cyclopropane being the most strained due to significantly deviating bond angles from the ideal tetrahedral angle. Therefore, the correct option is A,B, C,D and E.

Explanation:

When considering cycloalkanes, the ring strain plays a significant role in their stability. The order from most strained to least strained among the given cycloalkanes is as follows:

  1. Cyclopropane
  2. Cyclobutane
  3. Cyclopentane
  4. Cyclohexane
  5. Cycloheptane

This ranking is based on factors such as angle strain and steric repulsion. Cyclopropane is the most strained due to its 60° bond angles, which deviate significantly from the preferred 109.5° tetrahedral angle. Cyclopentane and cyclohexane have little strain as their bond angles are closer to the ideal tetrahedral angle, and cyclohexane in its chair conformation is almost strain-free. Cycloheptane, while larger, begins to exhibit some steric repulsion between groups on non-adjacent atoms. However, it is still less strained than smaller ring compounds.

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