Cycloalkane molecular formulas

Cycloalkanes are alkanes that contain a ring of three or more carbons They are fre quently encountered m organic chemistry and are characterized by the molecular formula C H2 Some examples include... 

What about a substance wrth the molecular formula 71414 Thrs compound can not be an alkane but may be erther a cycloalkane or an alkene because both these classes of hydrocarbons correspond to the general molecular formula C H2 Any time a ring or a double bond is present in an organic molecule its molecular formula has two fewer hydrogen atoms than that of an alkane with the same number of carbons... 

Compounds called cycloalkanes, having molecules with no double bonds but having a cyclic or ring structure, are isomeric with alkenes whose molecules contain the same number of carbon atoms. For example, cyclopentane and 2-pentene have the same molecular formula, C5H, but have completely... 

Cycloalkanes are cyclic saturated hydrocarbons with the general formula C H2 . Therefore, a substance with the formula C3H8 could not be a cycloalkane, since C3H8 conforms to the general formula, C H2 +2, the molecular formula for an alkane. It is, however, too small to be a branched alkane with a methyl group attached to the longest chain. In fact, C3H8 is propane. 

A cycloalkane can be represented by the molecular formula (CH2) , so the general reaction in the bomb calorimeter is... 

Cycloalkanes have molecular formula C H2 and contain carbon atoms arranged in a ring. 

Problem 4.10 The largest known cycloalkane with a single ring has 288 carbon atoms. What is its molecular formula ... 

There are two types of alkanes acyclic aikanes having molecular formula + 2, and cycloalkanes having molecular formula... 

Could a substance with the molecular formula C3Hg be a cycloalkane Could CjHg be a branched alkane having... 

If we compare the general molecular formulas for the Alkane, Alkene, and Alkyne families as well as the Cycloalkane and cycloalkene families we see the following relationship ... 

The molecular formula of the cycloalkanes follow the pattern where n is the number of... 

The cycloalkanes are a family having C—C single bonds in a ring structure. They have the general molecular formula QjHjn and thus have two fewer hydrogen atoms than the corresponding alkane (C H2 +2)- The relationship that exists between an alkane and a cycloalkane is shown for hexane and cyclohexane. 

SOLUTiON The molecular formula for a cycloalkane is C H2 . Because the molecular mass of both cycloalkanes is 98, their molecular formulas must be C7H14 (7 X 12 = 84 -h 14 = 98). Abase peak of 69 means the loss of an ethyl substituent (98 — 69 = 29), whereas a base peak of 83 means the loss of a methyl substituent (98 — 83 = 15). Because the cycloalkanes are known to be very stable, we can mle out cycloalkanes with three or four-membered rings. A seven-carbon cycloalkane with a base peak signifying the loss of an ethyl substituent must be ethylcyclopentane. A seven-carbon cycloalkane with a base peak signifying the loss of a methyl substituent must be methylcyclohexane. 

Ring formation in hydrocarbons can account for unsaturation. As the carbon-carbon single bond is formed, two hydrogens are lost. In other words, when an alkane gives rise to a cycloalkane, two hydrogens are lost from the original molecular formula determine how many... 

Ans. Alkenes and cycloalkanes have the same general formula and are constitutional isomers of each other. Knowing that the molecular formula of some unknown such as C5H10 fits the general formula C H2 tells us that it is not an alkane and that it is either an alkene or a cycloalkane. The molecular formula alone does not allow us to distinguish an alkene from a cycloalkane. However, alkenes and cycloalkanes have very different chemical properties. Cycloalkanes have similar chemical behavior as alkanes since both have the same kinds of bonds (C — C and C — H single bonds). The chemistry of alkenes is very different due to the presence of the carbon-carbon double bond (Sec. 12.6). 

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