Assertion :Cyclohexane is the most stable Cycloalkane. Reason: Cyclopropane and cyclobutane are less stable due to angle strain and torsional strain.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason is correct.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Cyclohexane is the most stable cycloalkane. Cyclopropane and cyclobutane are less stable due to angle strain and torsional strain.
The ideal bond angle $109^{0}$ 28' but in cycloalkanes this angle is mathematically 180-(360/n) where n is the number of atoms making ring. for example Cyclopropane, angle is $60^{0}$ ; in Cyclobutane it is $90^{0}$ and so on.

Hence, both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.

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