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Question
Which of the following is the most stable cycloalkane?
Which of the following is the most stable cycloalkane?
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Solution
The correct option is D Cyclohexane
Smaller cycloalkanes, cyclopropane and cyclobutane, have high ring strains because their bond angles deviate substantially from 109.5∘ and their hydrogens eclipse each other. Cyclopentane is a stable molecule with a small amount of ring strain, while cyclohexane is able to adopt the perfect geometry of a cycloalkane in which all angles are the ideal 109.5° and no hydrogens are eclipsed; it has no ring strain at all. Therefore its the most stable cycloalkane.
Smaller cycloalkanes, cyclopropane and cyclobutane, have high ring strains because their bond angles deviate substantially from 109.5∘ and their hydrogens eclipse each other. Cyclopentane is a stable molecule with a small amount of ring strain, while cyclohexane is able to adopt the perfect geometry of a cycloalkane in which all angles are the ideal 109.5° and no hydrogens are eclipsed; it has no ring strain at all. Therefore its the most stable cycloalkane.
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