A newly isolated natural product was found to have the molecular formula C15H28O2. By hydrogenating a sample of the compound, it was determined to possess one π bond. How many rings are present in the compound?

A) 0 B) 1 C) 2 D) 3 E) 4 A) 0 B) 1 C) 2 D) 3 E) 4

The steroid testosterone has the molecular formula C19H28O2. Given that there are two π bonds in a molecule of testosterone, how many rings are present in each molecule?

A) 2 B) 3 C) 4 D) 5 E) 6 A) 2 B) 3 C) 4 D) 5 E) 6

Exam 7: Structure and Synthesis of Alkenes; Elimination

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Cyclohexane has a molecular formula of C₆H₁₂ and an unsaturation number of 1. Is this compound considered to be unsaturated? Why or why not?

(Essay)

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Question 21

Which of the following alkenes has the smallest molar heat of hydrogenation (ie, releases the least heat upon hydrogenation)?

(Multiple Choice)

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Question 22

A newly isolated natural product was found to have the molecular formula C₁₅H₂₈O₂. By hydrogenating a sample of the compound, it was determined to possess one π bond. How many rings are present in the compound?

(Multiple Choice)

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Question 23

Which of the alkyl chlorides listed below undergoes dehydrohalogenation in the presence of a strong base to give pent-2-ene as the only alkene product?

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Question 24

Provide a correct IUPAC name for the structure below.

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Question 25

Provide the proper IUPAC name for the alkene shown below. CH₂ CHCH₂CH₂CH₂CH₃

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Question 26

Carbon-carbon single bonds tend to be and than carbon-carbon double bonds.

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Question 27

Does the alkene shown below violate Bredt's rule?

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Question 28

Which sequence ranks the following compounds in order of increasing heat of hydrogenation, ΔH_hyd? 1 cis-2-butene 2 1-butene 3 cyclohexene

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Question 29

Give the structures of three examples of molecules that have a molecular formula of C₆H₈. One of the structures should have only one ring and one of the structures should have no rings.

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Question 30

Name the compound shown below.

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Question 31

The carbon-carbon bond length in ethylene is than the carbon-carbon bond length in ethane, and the HCH bond angle in ethylene is the HCH bond angle in ethane.

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Question 32

Describe the major elimination products of the following reaction, including any stereochemistry, and indicate which structure will predominate. Explain and defend your answer.

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Question 33

The dehydrogenation of butane to trans-but-2-ene has ∆H° = +116 kJ/mol (+27.6 kcal/mol) and ∆S° = +117 J-kelvin/mol (+28.0 cal-kelvin/mol). Compute the value of ∆G° for dehydrogenation at room temperature (25°C or 298°K). Is dehydrogenation favored or disfavored?

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Question 34

Circle the most stable alkene in the set of isomers below.

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Question 35

Draw the alkene of formula C₅H₁₀which evolves the most heat per mole upon hydrogenation.

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Question 36

The steroid testosterone has the molecular formula C₁₉H₂₈O₂. Given that there are two π bonds in a molecule of testosterone, how many rings are present in each molecule?

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Question 37

Provide the reagents necessary for carrying out the transformation of cyclopentane to cyclopentene.

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Question 38

Draw a mechanism and use a chair structure to explain the major product that is formed in the reaction below.

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Question 39

Provide the proper IUPAC name for the alkene shown below.

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Question 40

Showing 21 - 40 of 131

Exam 7: Structure and Synthesis of Alkenes; Elimination

Cyclohexane has a molecular formula of C6H12 and an unsaturation number of 1. Is this compound considered to be unsaturated? Why or why not?

Which of the following alkenes has the smallest molar heat of hydrogenation (ie, releases the least heat upon hydrogenation)?

A newly isolated natural product was found to have the molecular formula C15H28O2. By hydrogenating a sample of the compound, it was determined to possess one π bond. How many rings are present in the compound?

Which of the alkyl chlorides listed below undergoes dehydrohalogenation in the presence of a strong base to give pent-2-ene as the only alkene product?

Provide a correct IUPAC name for the structure below.

Provide the proper IUPAC name for the alkene shown below. CH2 CHCH2CH2CH2CH3

Carbon-carbon single bonds tend to be ________ and ________ than carbon-carbon double bonds.

Does the alkene shown below violate Bredt's rule?

Which sequence ranks the following compounds in order of increasing heat of hydrogenation, ΔHhyd? 1 cis-2-butene 2 1-butene 3 cyclohexene

Give the structures of three examples of molecules that have a molecular formula of C6H8. One of the structures should have only one ring and one of the structures should have no rings.

Name the compound shown below.

The carbon-carbon bond length in ethylene is ________ than the carbon-carbon bond length in ethane, and the HCH bond angle in ethylene is ________ the HCH bond angle in ethane.

Describe the major elimination products of the following reaction, including any stereochemistry, and indicate which structure will predominate. Explain and defend your answer.

The dehydrogenation of butane to trans-but-2-ene has ∆H° = +116 kJ/mol (+27.6 kcal/mol) and ∆S° = +117 J-kelvin/mol (+28.0 cal-kelvin/mol). Compute the value of ∆G° for dehydrogenation at room temperature (25°C or 298°K). Is dehydrogenation favored or disfavored?

Circle the most stable alkene in the set of isomers below.

Draw the alkene of formula C5H10 which evolves the most heat per mole upon hydrogenation.

The steroid testosterone has the molecular formula C19H28O2. Given that there are two π bonds in a molecule of testosterone, how many rings are present in each molecule?

Provide the reagents necessary for carrying out the transformation of cyclopentane to cyclopentene.

Draw a mechanism and use a chair structure to explain the major product that is formed in the reaction below.

Provide the proper IUPAC name for the alkene shown below.

Structure and Bonding

Acids and Bases; Functional Groups

Structure and Stereochemistry of Alkanes

The Study of Chemical Reactions

Stereochemistry

Alkyl Halides; Nucleophilic Substitution

Reactions of Alkenes

Structure and Synthesis of Alcohols

Reactions of Alcohols

Infrared Spectroscopy and Mass Spectrometry

Nuclear Magnetic Resonance Spectroscopy

Ethers, Epoxides, and Thioethers

Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy

Aromatic Compounds

Reactions of Aromatic Compounds

Ketones and Aldehydes

Amines

Carboxylic Acids

Carboxylic Acid Derivatives

Condensations and Alpha Substitutions of Carboxyl Compounds

Carbohydrates and Nucleic Acids

Amino Acids, Peptides, and Proteins

Lipids

Synthetic Polymers

Filters

Cyclohexane has a molecular formula of C₆H₁₂ and an unsaturation number of 1. Is this compound considered to be unsaturated? Why or why not?

A newly isolated natural product was found to have the molecular formula C₁₅H₂₈O₂. By hydrogenating a sample of the compound, it was determined to possess one π bond. How many rings are present in the compound?

Provide the proper IUPAC name for the alkene shown below. CH₂ CHCH₂CH₂CH₂CH₃

Carbon-carbon single bonds tend to be and than carbon-carbon double bonds.

Which sequence ranks the following compounds in order of increasing heat of hydrogenation, ΔH_hyd? 1 cis-2-butene 2 1-butene 3 cyclohexene

Give the structures of three examples of molecules that have a molecular formula of C₆H₈. One of the structures should have only one ring and one of the structures should have no rings.

The carbon-carbon bond length in ethylene is than the carbon-carbon bond length in ethane, and the HCH bond angle in ethylene is the HCH bond angle in ethane.

Draw the alkene of formula C₅H₁₀which evolves the most heat per mole upon hydrogenation.

The steroid testosterone has the molecular formula C₁₉H₂₈O₂. Given that there are two π bonds in a molecule of testosterone, how many rings are present in each molecule?