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Niharika Kalita posted an Question
June 02, 2020 • 02:40 am
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10 points
10 points
- IIT JAM
- Chemistry (CY)
Give the order of decreasing heats of combustion of cycloalkanes explaining the reason. cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, cycl
Give the order of decreasing heats of combustion of cycloalkanes explaining the reason. Cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, cycloctane. Please explain in detail.
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Lingareddy 1
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Every time a −CH2−CHX2 group is added, the heat of combustion is increased by almost 650 kJ/mol; whereas the maximum relief in ring strain attained by adding that −CH2−CHX2 group is not more than 25 kJ/mol. So there is no competiton between increase in heat of combustion due to more number of carbon atoms and decrease in it caused by ring stability. Everytime you see two hydrocarbons with different number of carbon atoms, be assured that the one with more carbon will realease more heat on combustion.
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Why is the heat of combustion of cycloheptane greater than cyclohexane whereas in rest of the cases it keeps decreasing. Explain in detail.