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Give the structure for each of the following. a. 3 -hexene b. \(2,4-\) heptadiene c. 2 -methyl- 3 -octene

Short Answer

Expert verified
a. \(H_2C{=}CH-CH_2-CH_2-CH_2-CH_3\) b. \(H_2C{=}CH-CH{=}CH-CH_2-CH_2-CH_3\) c. \(H_3C-CH(CH_3)-CH{=}CH-CH_2-CH_2-CH_2-CH_3\)

Step by step solution

01

Identify the main carbon chain

Hexene indicates that we have a six-carbon chain (hex-) with a double bond (-ene). Since the double bond starts at carbon 3 (3-hexene), we can draw the structure as follows: \(H_2C{=}CH-CH_2-CH_2-CH_2-CH_3\) b. 2,4-heptadiene
02

Identify the main carbon chain

Heptadiene indicates that we have a seven-carbon chain (hept-) with two double bonds (-diene). The double bonds start at carbons 2 and 4 (2,4-heptadiene), so we can draw the structure like this: \(H_2C{=}CH-CH{=}CH-CH_2-CH_2-CH_3\) c. 2-methyl-3-octene
03

Identify the main carbon chain

Octene indicates that we have an eight-carbon chain (oct-) with a double bond (-ene). The double bond starts at carbon 3 (3-octene), and there is a methyl group (-CH_3) attached to carbon 2 (2-methyl). We can draw the structure as follows: \( H_3C-CH(CH_3)-CH{=}CH-CH_2-CH_2-CH_2-CH_3 \)

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Alkenes
Alkenes are a type of hydrocarbon that contain at least one carbon-carbon double bond. The presence of this double bond is a defining characteristic and affects the chemical properties of the molecule. In the simplest alkene, ethene (C2H4), the carbon atoms are connected by a double bond, and each carbon is also bonded to two hydrogen atoms.

When naming alkenes, the suffix '-ene' is used to indicate the presence of this double bond. The position of the double bond is specified by a number placed in front of the alkene name. For instance, '3-hexene' has the double bond starting at the third carbon of a six-carbon chain.

Alkenes follow the general formula \( C_nH_{2n} \), showing that they have two hydrogen atoms less than alkanes (which have single bonds only). This unsaturation allows alkenes to participate in a variety of reactions, such as addition reactions, making them chemically versatile and important in organic synthesis.
Alkadienes
Alkadienes, or dienes for short, are hydrocarbons that have two carbon-carbon double bonds in their structure. The naming of alkadienes incorporates similar rules to that of alkenes but with an emphasis on indicating the presence of two double bonds. This is done by using the prefix 'di-', along with the '-ene' suffix to identify the compound as an alkadiene.

In '2,4-heptadiene', the numbers '2,4' indicate the starting positions of the double bonds along the seven-carbon chain. Notation of multiple bonded positions is separated by commas and placed before the name of the hydrocarbon chain.

The presence of multiple double bonds in alkadienes adds complexity to their reactivity and can lead to various isomers depending on the positions and cis/trans configurations of the double bonds. These compounds play a significant role in polymer chemistry, where they can form intricate structures and materials with diverse properties.
Structural Formula
The structural formula represents the arrangement of atoms within a molecule. Unlike the molecular formula, which tells us only the number of each type of atom, the structural formula provides insight into how those atoms are connected. For organic compounds, showing the arrangement of carbon and hydrogen atoms, as well as any functional groups, is crucial to understanding their chemical behavior.

For example, the structural formula for '2-methyl-3-octene' incorporates not only the main eight-carbon chain of an alkene but also an additional methyl group (CH3) attached to the second carbon atom. This level of detail can reveal the relative positioning of groups and the potential for chemical reactions.

Correctly interpreting structural formulas is an essential skill in organic chemistry, as it allows students and chemists to visualize molecules and predict how they might interact with other substances. The line-angle formula, which simplifies the depiction by showing carbon bonds as lines and carbon atoms as the ends or intersections of lines (hydrogen atoms are often omitted for simplicity), is a common way to represent organic structures for clarity and ease of interpretation.

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Most popular questions from this chapter

If one hydrogen in a hydrocarbon is replaced by a halogen atom, the number of isomers that exist for the substituted compound depends on the number of types of hydrogen in the original hydrocarbon. Thus there is only one form of chloroethane (all hydrogens in ethane are equivalent), but there are two isomers of propane that arise from the substitution of a methyl hydrogen or a methylene hydrogen. How many isomers can be obtained when one hydrogen in each of the compounds named below is replaced by a chlorine atom? a. \(n\) -pentane c. 2,4 -dimethylpentane b. 2 -methylbutane d. methylcyclobutane

Consider the compounds butanoic acid, pentanal, \(n\) -hexane, and \(1-\) pentanol. The boiling points of these compounds (in no specific order) are \(69^{\circ} \mathrm{C}, 103^{\circ} \mathrm{C}, 137^{\circ} \mathrm{C},\) and \(164^{\circ} \mathrm{C} .\) Match the boiling points to the correct compound.

For each of the following, fill in the blank with the correct response(s). All of the following pertain to nucleic acids. a. The substance in the nucleus of the cell that stores and transmits genetic information is DNA, which stands for _________ b. The basic repeating monomer units of DNA and RNA are called _______ c. The pentose deoxyribose is found in DNA, whereas ________is found in RNA. d. The basic linkage in DNA or RNA between the sugar molecule and phosphoric acid is a phosphate _______ linkage. e. The bases on opposite strands of DNA are said to be __________ to each other, which means the bases fit together specifically by hydrogen bonding to one another. f. In a strand of normal DNA, the base__________is always always found paired with cytosine. g. A given segment of the DNA molecule, which contains the molecular coding for a specific protein to be synthesized, is referred to as a _______ h. During protein synthesis, ______RNA molecules attach to and transport specific amino acids to the appropriate position on the pattern provided by _______RNA molecules. i. The codes specified by ________are responsible for assembling the correct primary structure of proteins.

Answer the following questions regarding the formation of polymers. a. What structural features must be present in a monomer in order to form a homopolymer polyester? b. What structural features must be present in the monomers in order to form a copolymer polyamide? (Hint: Nylon is an example of a polyamide. When the monomers link together to form nylon, an amide functional group results from each linkage.) c. What structural features must be present in a monomer that can form both an addition polymer and a condensation polymer?

There are three isomers of dichlorobenzene, one of which has now replaced naphthalene as the main constituent of mothballs. a. Identify the ortho, the meta, and the para isomers of dichlorobenzene. b. Predict the number of isomers for trichlorobenzene. c. It turns out that the presence of one chlorine atom on a benzene ring will cause the next substituent to add ortho or para to the first chlorine atom on the benzene ring. What does this tell you about the synthesis of \(m\) -dichlorobenzene? d. Which of the isomers of trichlorobenzene will be the hardest to prepare?

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