A certain hydrocarbon has a molecular formula of C7H12. Which of the following is not a structural possibility for this hydrocarbon? (a) It is a cycloalkane. (b) It is an alkyne. (c) It contains one ring and one double bond. (d) It contains two double bonds and no rings.

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Hydrocarbons are organic molecules that solely consist of hydrogen and carbon atoms. These compounds are considered saturated if they contain the maximum number of hydrogen atoms. Degrees of unsaturation are structural features that cause a compound to have less than the maximum number of hydrogen atoms possible, and cause the hydrocarbon to be considered unsaturated. In hydrocarbons, degrees of unsaturation consist of ring structures and pi bonds (double and triple bonds). The following formulas can be used to determine whether a molecular formula represents an alkane, alkene, or alkyne (assuming that the hydrocarbons are not ring structures, and that the unsaturated compounds only have one double or triple bond).

Alkanes: CnH2n+2

Alkenes: CnH2n

Alkynes: CnH2nâ2

For the following formula, C10H14, calculate the IHD...

Then, the type of unsaturation that might be present is....
a. no unsaturation; no multiple bonds or ring closings
b. one double bond or one ring closing
c. three double bonds or three rings closing; or two double bondsand one ring closing; or one double bond and two rings closing; orone triple bond and one double bond;or one triple bond and one ringclosing
d. many possibilities, most likely benzene ring

33. Based on the molecular formula, determine whether each com- pound is an alkane, alkene, or alkyne. (Assume that the hydro- carbons are noncyclical and there is no more than one multiple bond.) a. CsH12 b. C3H6 c. C7H12 d. C1H22

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A certain hydrocarbon has a molecular formula of C7H12. Which of the following is not a structural possibility for this hydrocarbon? (a) It is a cycloalkane. (b) It is an alkyne. (c) It contains one ring and one double bond. (d) It contains two double bonds and no rings.

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