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Question

Which of the following has maximum angle strain?
a) Cyclopropane
​b) Cyclobutane
​c) Cyclopentane
​d) Cyclohexane

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Solution

More the number of carbon atom more will be the stability and has less angle strain. Thus cyclopropane has less stability and has more bond angle strain
Bond angle strain of cyclopropane = 12[109028' - bond angle of the cyclopropane] = 12[109028' - 60] = 49028'2 = 24058'Bond angle strain of cyclobutane = 12[109028' - bond angle of the cyclobutane] = 12[109028' - 90] = 19028'2 = 9058'Bond angle strain of cyclopentane = 12[109028' - bond angle of the cyclopentane] = 12[109028' - 108] = 1028'2 =0.58'Bond angle strain of cyclohexane = 12[109028' - bond angle of the cyclohexane] = 12[109028' - 120] = - 10032'2 = - 5016'

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