Organic Chemistry Quiz: Alkenes and Alkynes

Questions and Answers

What is the general formula for an alkene?

CnH2n

What is the general formula for an alkyne?

CnH2n-2

What is the geometry expected around a carbon atom in the bond of an alkene?

120 degrees

Which compound corresponds to an unsaturated hydrocarbon?

4-octene Signup and view all the answers

Which of the following fatty acids is predicted to have the highest melting point?

CH3(CH2)14COOH Signup and view all the answers

What configuration does the following molecule have?

trans Signup and view all the answers

Are the structures shown considered constitutional isomers, cis-trans isomers, the same molecules, or are they not related?

cis-trans isomers Signup and view all the answers

Which of the following compounds can exist as cis-trans isomers?

2-pentene Signup and view all the answers

What is the correct IUPAC name for the compound shown here?

1,1-dichloroethene Signup and view all the answers

What is the correct IUPAC name for the compound shown here?

6-methyl-3-octene Signup and view all the answers

What is the correct IUPAC name for the compound shown here?

4-isopropyl-2-methyl-1-nonene Signup and view all the answers

What is the correct IUPAC name for the compound shown here?

cis-3-octene Signup and view all the answers

What is the correct IUPAC name for the compound shown here?

cis-2-pentene Signup and view all the answers

What is the correct IUPAC name for the compound shown here?

trans-3-octene Signup and view all the answers

What is the correct IUPAC name for the compound shown here?

2-methyl-1,3-butadiene Signup and view all the answers

What is the correct IUPAC name of the compound shown here?

1,4-pentadiene Signup and view all the answers

What is the correct IUPAC name for the compound shown here?

1,3-cyclopentadiene Signup and view all the answers

The reaction of an alkene with water produces what type of product?

alcohol Signup and view all the answers

What type of reaction converts 4-decene into decane?

hydrogenation Signup and view all the answers

Which of the following reaction conditions results in Markovnikov addition to an unsymmetrical alkene?

HBr: The addition of HBr to an unsymmetrical alkene is a regioselective reaction that proceeds through the most stable carbocation intermediate. Signup and view all the answers

The reaction of 1-butene and hydrogen in the presence of a Pd catalyst produces?

butane Signup and view all the answers

What is the major product of the reaction of 2-hexene with bromine?

2,3-dibromohexane Signup and view all the answers

What is the major product formed from the reaction of 3-hexene and HCl?

3-chlorohexane Signup and view all the answers

What is the major product of the reaction shown below?

2-chloropropane Signup and view all the answers

What reagents are required to convert ethene to ethane?

H2 Signup and view all the answers

What is the IUPAC name of the compound shown here?

4-methyl-2-pentyne Signup and view all the answers

What is the angle expected around a carbon atom in the triple bond of an alkyne?

180 degrees Signup and view all the answers

Which compound corresponds to an unsaturated hydrocarbon?

2-pentyne Signup and view all the answers

What type of product is formed in the hydration of 1-butyne?

ketone Signup and view all the answers

What is the name of the alkyne shown here?

1-bromo-1-butyne Signup and view all the answers

Name the structure shown here?

3-methyl-1-pentyne Signup and view all the answers

What is the correct IUPAC name for the compound shown here?

6,6-diethyl-3-octyne Signup and view all the answers

What is the expected product from the addition reaction of excess HBr to 2-butyne?

2,2-dibromobutane Signup and view all the answers

What is the IUPAC name for the compound shown here?

1-bromo-3-hexyne Signup and view all the answers

What unstable intermediate is formed in the hydration of an alkyne?

enol Signup and view all the answers

The reaction of 2-pentyne with excess hydrogen gas in the presence of Pd produces what compound?

pentane Signup and view all the answers

What is used to describe the arrangement of the substituents on the benzene in the compound shown?

para (1,4) Signup and view all the answers

Which of the following describes the arrangement of the substituents in the compound shown?

ortho (1,2) Signup and view all the answers

What type of functionality does phenol contain besides aromatic ring?

hydroxy Signup and view all the answers

Provide an explanation for why the structure of benzene is often depicted as shown, with a circle representing the electrons inside the ring, rather than alternating single and double bonds.

Benzene exists as two equally contributing resonance structures. Signup and view all the answers

The term aromatic is a structural term that applies to cyclic conjugated molecules that are planar and lack alkene-like reactivity due to enhanced resonance stabilization. Which of the following compounds is not classified as an aromatic compound?

cyclohexadiene Signup and view all the answers

What is the molecular formula for the aromatic compound naphthalene shown here?

C10H8 Signup and view all the answers

What is the common name for 1,2-dimethylbenzene?

ortho-xylene Signup and view all the answers

What is the correct common name for the compound here?

para-dichlorobenzene Signup and view all the answers

What is the correct IUPAC name for the compound shown here?

1,3,5-trimethylbenzene Signup and view all the answers

What is the correct IUPAC name for the compound shown here?

1-bromo-3-chlorobenzene Signup and view all the answers

An alkene hydrocarbon readily undergoes a hydrogenation reaction to afford an alkane in the presence of hydrogen gas (H₂) and a metal catalyst. Explain why benzene cannot be hydrogenated under similar conditions.

Benzene is especially stabilized due to resonance. Signup and view all the answers

What reagents are required to accomplish the following reaction?

HNO3, H2SO4, heat Signup and view all the answers

Which of the following is the major product of the reaction between benzene and bromine in the presence of FeBr₃ catalyst?

bromobenzene Signup and view all the answers

What type of reactions does benzene commonly undergo?

substitution Signup and view all the answers

What is the correct IUPAC name for the compound shown here?

4-bromo-1-butene Signup and view all the answers

What is the expected product from the addition reaction of cyclohexene with chlorine (Cl₂)?

1,2-dichlorocyclohexane Signup and view all the answers

What is the major product of the reaction shown here?

cyclohexane Signup and view all the answers

What reagents are required to convert 1-butene to 2-bromobutane?

HBr Signup and view all the answers

Which of the following reactions would form 2-bromobutane as the major product?

2-butene + HBr Signup and view all the answers

What is the correct IUPAC name for the compound shown here?

3,3-dichloro-1-propyne Signup and view all the answers

What is the expected product from the addition reaction of one equivalent of HBr to 1-hexyne?

2-bromo-1-hexene Signup and view all the answers

Study Notes

Alkenes and Alkynes

General formula for alkenes: CnH2n
General formula for alkynes: CnH2n-2
Geometry around a carbon atom in an alkene: 120 degrees
Unsaturated hydrocarbon examples: 4-octene, 2-pentyne

Fatty Acids and Melting Points

Fatty acid with the highest melting point: CH3(CH2)14COOH

Isomer Configurations

Configuration types: trans, cis-trans isomers
Compound with cis-trans isomer potential: 2-pentene

IUPAC Naming Conventions

IUPAC name for various compounds includes:
- 1,1-dichloroethene
- 6-methyl-3-octene
- 4-isopropyl-2-methyl-1-nonene
- cis-3-octene
- cis-2-pentene
- trans-3-octene
- 2-methyl-1,3-butadiene
- 1,4-pentadiene
- 1,3-cyclopentadiene
- 4-methyl-2-pentyne
- 6,6-diethyl-3-octyne
- 1-bromo-1-butyne
- 3-methyl-1-pentyne
- 1-bromo-3-hexyne
- 3,3-dichloro-1-propyne

Reactions of Alkenes and Alkynes

Alkene reaction with water yields: alcohol
Hydrogenation converts 4-decene into: decane
Major product of 2-hexene reaction with bromine: 2,3-dibromohexane
Major product of 3-hexene and HCl reaction: 3-chlorohexane
Reaction of 1-butene with hydrogen and Pd catalyst produces: butane
Hydration of 1-butyne produces: ketone
Expected product from excess HBr added to 2-butyne: 2,2-dibromobutane

Aromatic Compounds

Aromatic compounds defined by cyclic, conjugated structures that are planar and stabilized by resonance.
Non-aromatic example: cyclohexadiene
Molecular formula for naphthalene: C10H8
Common names include:
- 1,2-dimethylbenzene: ortho-xylene
- 1,4-dichlorobenzene: para-dichlorobenzene
Common reactions include: electrophilic aromatic substitution
Benzene stabilizes due to resonance and does not hydrogenate easily.

Substitution and Addition Reactions

Benzene commonly undergoes: substitution reactions (replacing hydrogen with another group).
Reagents for nitration of benzene: HNO3, H2SO4, heat
Major product from bromobenzene reaction with bromine and FeBr₃ catalyst: bromobenzene

Other Reactions

Addition of Cl₂ to cyclohexene results in: 1,2-dichlorocyclohexane
Conversion of 1-butene to 2-bromobutane requires: HBr
Reaction condition yielding 2-bromobutane as major product: 2-butene + HBr

These notes summarize the key concepts about hydrocarbons, their reactions, and relation to isomers and nomenclature to prepare for examinations.

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This quiz covers key concepts related to alkenes and alkynes, including their general formulas and molecular geometry. Test your knowledge on the characteristics of unsaturated hydrocarbons and the structures of various fatty acids. Perfect for students studying organic chemistry.

Organic Chemistry Quiz: Alkenes and Alkynes

Questions and Answers

What is the general formula for an alkene?

What is the general formula for an alkyne?

What is the geometry expected around a carbon atom in the bond of an alkene?

Which compound corresponds to an unsaturated hydrocarbon?

Which of the following fatty acids is predicted to have the highest melting point?

What configuration does the following molecule have?

Are the structures shown considered constitutional isomers, cis-trans isomers, the same molecules, or are they not related?

Which of the following compounds can exist as cis-trans isomers?

What is the correct IUPAC name for the compound shown here?

What is the correct IUPAC name for the compound shown here?

What is the correct IUPAC name for the compound shown here?

What is the correct IUPAC name for the compound shown here?

What is the correct IUPAC name for the compound shown here?

What is the correct IUPAC name for the compound shown here?

What is the correct IUPAC name for the compound shown here?

What is the correct IUPAC name of the compound shown here?

What is the correct IUPAC name for the compound shown here?

The reaction of an alkene with water produces what type of product?

What type of reaction converts 4-decene into decane?

Which of the following reaction conditions results in Markovnikov addition to an unsymmetrical alkene?

The reaction of 1-butene and hydrogen in the presence of a Pd catalyst produces?

What is the major product of the reaction of 2-hexene with bromine?

What is the major product formed from the reaction of 3-hexene and HCl?

What is the major product of the reaction shown below?

What reagents are required to convert ethene to ethane?

What is the IUPAC name of the compound shown here?

What is the angle expected around a carbon atom in the triple bond of an alkyne?

Which compound corresponds to an unsaturated hydrocarbon?

What type of product is formed in the hydration of 1-butyne?

What is the name of the alkyne shown here?

Name the structure shown here?

What is the correct IUPAC name for the compound shown here?

What is the expected product from the addition reaction of excess HBr to 2-butyne?

What is the IUPAC name for the compound shown here?

What unstable intermediate is formed in the hydration of an alkyne?

The reaction of 2-pentyne with excess hydrogen gas in the presence of Pd produces what compound?

What is used to describe the arrangement of the substituents on the benzene in the compound shown?

Which of the following describes the arrangement of the substituents in the compound shown?

What type of functionality does phenol contain besides aromatic ring?

Provide an explanation for why the structure of benzene is often depicted as shown, with a circle representing the electrons inside the ring, rather than alternating single and double bonds.

The term aromatic is a structural term that applies to cyclic conjugated molecules that are planar and lack alkene-like reactivity due to enhanced resonance stabilization. Which of the following compounds is not classified as an aromatic compound?

What is the molecular formula for the aromatic compound naphthalene shown here?

What is the common name for 1,2-dimethylbenzene?

What is the correct common name for the compound here?

What is the correct IUPAC name for the compound shown here?

What is the correct IUPAC name for the compound shown here?

An alkene hydrocarbon readily undergoes a hydrogenation reaction to afford an alkane in the presence of hydrogen gas (H₂) and a metal catalyst. Explain why benzene cannot be hydrogenated under similar conditions.

What reagents are required to accomplish the following reaction?

Which of the following is the major product of the reaction between benzene and bromine in the presence of FeBr₃ catalyst?

What type of reactions does benzene commonly undergo?

What is the correct IUPAC name for the compound shown here?

What is the expected product from the addition reaction of cyclohexene with chlorine (Cl₂)?

What is the major product of the reaction shown here?

What reagents are required to convert 1-butene to 2-bromobutane?

Which of the following reactions would form 2-bromobutane as the major product?

What is the correct IUPAC name for the compound shown here?

What is the expected product from the addition reaction of one equivalent of HBr to 1-hexyne?

Study Notes

Alkenes and Alkynes

Fatty Acids and Melting Points

Isomer Configurations

IUPAC Naming Conventions

Reactions of Alkenes and Alkynes

Aromatic Compounds

Substitution and Addition Reactions

Other Reactions

Studying That Suits You

Description

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