Question

Which of the following cycloalkanes has the least angle strain?

1) Cyclopropane
2) Cyclobutane
3) Cyclopentane
4) Cyclohexane

Answer 1

Cyclopentane has the least angle strain among the given cycloalkanes.

Step-by-step explanation:

The cycloalkane with the least angle strain is cyclopentane. Cyclopentane has a bond angle of about 108°, which is very close to the ideal bond angle of 109.5°. This minimal ring strain makes cyclopentane a more stable compound compared to cyclopropane and cyclobutane.