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Chapter 26: Problem 49

Why is it not necessary to refer to ethene and propene as 1 -ethene and 1 -propene? Can the same be said for butene?

Short Answer

Expert verified
It is not necessary to refer to Ethene and Propene as 1-Ethene and 1-Propene because these molecules can only exist in one form, which means that the double bond is assumed to be at the first carbon. Butene, however, can exist in different forms, known as isomers (namely 1-Butene and 2-Butene), thus making it necessary to indicate the position of the double bond.

Step by step solution

01

Explain Basic Nomenclature Rule

The reason why we don't refer to compounds like Ethene (\(C_2H_4\)) and Propene (\(C_3H_6\)) as 1-Ethene and 1-Propene is because these compounds can only form one structure. The naming of organic compounds follows certain rules - one of them is that if a compound can exist in only one form, it's not necessary to mention the carbon number where the double bond exists as it is assumed to be at the first carbon.
02

Explain The Case of Butene and its Isomers

Butene (\(C_4H_8\)), on the other hand, has two isomers: 1-Butene & 2-Butene. Because we can move the double bond to a different carbon atom, there are two possible structures for butene. Hence, we need to specify the carbon number where the double bond exists in this case.
03

Draw The Structures of the Isomers

To clarify, consider the two possible structures for Butene: 1-Butene is the molecule where the double bond is between the first and second carbon change, whereas in 2-Butene, the double bond is between the second and third carbon chain.

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Most popular questions from this chapter

Draw the structure for each of the following. (a) \((R)-1\) -bromo-1-chloroethane (b) ( \(E\) )-2-bromo-2-pentene (c) \((Z)-1-\) chloro- 3 -ethyl- 3 -heptene (d) \((R)\) -2-hydroxypropanoic acid (e) ( \(S\) )-2-aminopropanoate anion.

Identify the functional group in each compound (i.e., alcohol, amine, etc.). (a) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOH}\) (b) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHCH}_{2} \mathrm{OCH}_{3}\) (c) \(\mathrm{CH}_{3} \mathrm{CH}\left(\mathrm{NH}_{2}\right) \mathrm{CH}_{2} \mathrm{CH}_{3}\) (d) \(\mathrm{CH}_{3} \mathrm{COOCH}_{3}\).

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