Which of the following cycloalkanes has least ring-strain?

Cyclopropane

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Cyclobutane

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Cyclopentane

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Cyclohexane

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Solution

The correct option is A Cyclohexane
Cyclohexane has least ring-strain.
Cyclohexane has 6 C atoms in the ring. With increase in the number of C atoms in the ring, the ring-strain decreases.
The decreasing order of ring strain is cyclopropane (3) > cyclobutane (4) > cyclopentane (5) > cyclohexane (6).
The numbers in bracket represents the number of C atoms in the ring.

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