Question 1

How many constitutional isomers are there with the molecular formula C5H12?

Accepted Answer

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

Question 2

What is the approximate dihedral angle between the two chlorine atoms in the diaxial conformation of trans-1,2-dichlorocyclohexane?

Accepted Answer

A) 0$\circ$ 
B) 60$\circ$ 
C) 120$\circ$ 
D) 180$\circ$ 
A) 0$\circ$ 
B) 60$\circ$ 
C) 120$\circ$ 
D) 180$\circ$

Question 3

Provide a line-bond structure of pentanal.

Accepted Answer

The answer of Provide a line-bond structure of pentanal....

Question 4

What is the IUPAC name of the following compound?

Accepted Answer

A) 2,4-dimethyl-3-isopropyl-pentane 
B) 3-isopropyl-1,5-dimethylpentane 
C) 3-isopropyl-2,4-dimethylpentane 
D) triisopropylmethane 
A) 2,4-dimethyl-3-isopropyl-pentane 
B) 3-isopropyl-1,5-dimethylpentane 
C) 3-isopropyl-2,4-dimethylpentane 
D) triisopropylmethane

Question 5

Which of the following structures is different from the other three?

Accepted Answer

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

Question 6

Which of the following compounds has only 1$\circ$ and 3$\circ$carbon atoms?

Accepted Answer

A) hexane 
B) 2-methylpentane 
C) 3-methylpentane 
D) 2,3-dimethylbutane 
A) hexane 
B) 2-methylpentane 
C) 3-methylpentane 
D) 2,3-dimethylbutane

Question 7

What is the IUPAC name of the following compound?

Accepted Answer

The answer of What is the IUPAC name of the...

Question 8

Match the Newman projection for the conformation of 2-methylbutane to the indicated position on the potential energy diagram.   A)  B)  C)  
D) 
-Conformation C is represented by Roman numeral ____.

Accepted Answer

The answer of Match the Newman projection for the conformation...

Question 9

How many hydrogen atoms are there in octane?

Accepted Answer

The answer of How many hydrogen atoms are there in...

Question 10

Which of the following statements is not true?

Accepted Answer

A) Combustion of an alkane is an exothermic reaction. 
B) The heat of combustion of propane is three times that of methane. 
C) The constitutional isomers of C7H16 have different heats of combustion from one another 
D) The products of combustion of an alkane are H2O and CO2. 
A) Combustion of an alkane is an exothermic reaction. 
B) The heat of combustion of propane is three times that of methane. 
C) The constitutional isomers of C7H16 have different heats of combustion from one another 
D) The products of combustion of an alkane are H2O and CO2.

Question 11

Match the Newman projection for the conformation of 2-methylbutane to the indicated position on the potential energy diagram.   A)  B)  C)  
D) 
-Conformation B is represented by Roman numeral ____.

Accepted Answer

The answer of Match the Newman projection for the conformation...

Question 12

Which of the following compounds can adopt a chair conformation in which there are no axial methyl groups?

Accepted Answer

A) cis-1,2-dimethylcyclohexane 
B) cis-1,3-dimethylcyclohexane 
C) trans-1,3-dimethylcyclohexane 
D) cis-1,4-dimethylcyclohexane 
A) cis-1,2-dimethylcyclohexane 
B) cis-1,3-dimethylcyclohexane 
C) trans-1,3-dimethylcyclohexane 
D) cis-1,4-dimethylcyclohexane

Question 13

What is the correct assignment of common names for the following molecules?

Accepted Answer

A) i = butane; ii = neopentane; iii = isopentane 
B) i = neobutane; ii = isobutane; iii = pentane 
C) i = butane; ii = isobutane; iii = isopentane 
D) i = butane; ii = isobutane; iii = neopentane 
A) i = butane; ii = neopentane; iii = isopentane 
B) i = neobutane; ii = isobutane; iii = pentane 
C) i = butane; ii = isobutane; iii = isopentane 
D) i = butane; ii = isobutane; iii = neopentane

Question 14

Which of the following substituted cyclohexanes has the most negative value of $\Delta$G$\circ$ for ring flipping from the conformation in which the substituent is axial to the one where it is equatorial?

Accepted Answer

A) methylcyclohexane 
B) chlorocyclohexane 
C) isopropylcyclohexane 
D) ethynylcyclohexane 
A) methylcyclohexane 
B) chlorocyclohexane 
C) isopropylcyclohexane 
D) ethynylcyclohexane

Question 15

Which of the following Newman projections does not represent 2-methylhexane?

Accepted Answer

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

Question 16

What is the correct assignment of common names for the following molecules?

Accepted Answer

A) i = pentane; ii = isopentane; iii = neopentane 
B) i = neopentane; ii = isopentane; iii = pentane 
C) i = pentane; ii = neopentane; iii = isopentane 
D) i = neopentane; ii = pentane; iii = isopentane 
A) i = pentane; ii = isopentane; iii = neopentane 
B) i = neopentane; ii = isopentane; iii = pentane 
C) i = pentane; ii = neopentane; iii = isopentane 
D) i = neopentane; ii = pentane; iii = isopentane

Question 17

What is the approximate C-C-C bond angle in propane?

Accepted Answer

A) 90$\circ$ 
B) 109$\circ$ 
C) 120$\circ$ 
D) 180$\circ$ 
A) 90$\circ$ 
B) 109$\circ$ 
C) 120$\circ$ 
D) 180$\circ$

Question 18

What is the IUPAC name of the following compound?

Accepted Answer

A) 5,5-dimethyl-3-ethylheptane 
B) 5-ethyl-3,3-dimethyl-heptane 
C) 3,3-dimethyl-5-ethylheptane 
D) 3-ethyl-5,5-dimethyl-heptane 
A) 5,5-dimethyl-3-ethylheptane 
B) 5-ethyl-3,3-dimethyl-heptane 
C) 3,3-dimethyl-5-ethylheptane 
D) 3-ethyl-5,5-dimethyl-heptane

Question 19

What is the IUPAC name of the following compound?

Accepted Answer

A) bicyclo[4.3]nonane 
B) bicyclo[4.3.0]nonane 
C) bicyclo[6.5]nonane 
D) bicyclo[6.5.0]nonane 
A) bicyclo[4.3]nonane 
B) bicyclo[4.3.0]nonane 
C) bicyclo[6.5]nonane 
D) bicyclo[6.5.0]nonane

Question 20

What is the approximate dihedral angle between the two chlorine atoms in the diequatorial conformation of trans-1,2-dichlorocyclohexane?

Accepted Answer

A) 0$\circ$ 
B) 60$\circ$ 
C) 120$\circ$ 
D) 180$\circ$ 
A) 0$\circ$ 
B) 60$\circ$ 
C) 120$\circ$ 
D) 180$\circ$

Exam 2: Alkanes and Cycloalkanes

How many constitutional isomers are there with the molecular formula C5H12?

What is the approximate dihedral angle between the two chlorine atoms in the diaxial conformation of trans-1,2-dichlorocyclohexane?

Provide a line-bond structure of pentanal.

What is the IUPAC name of the following compound?

Which of the following structures is different from the other three?

Which of the following compounds has only 1 ∘\circ∘ and 3 ∘\circ∘ carbon atoms?

What is the IUPAC name of the following compound?

Match the Newman projection for the conformation of 2-methylbutane to the indicated position on the potential energy diagram. A) B) C) D) -Conformation C is represented by Roman numeral ____.

How many hydrogen atoms are there in octane?

Which of the following statements is not true?

Match the Newman projection for the conformation of 2-methylbutane to the indicated position on the potential energy diagram. A) B) C) D) -Conformation B is represented by Roman numeral ____.

Which of the following compounds can adopt a chair conformation in which there are no axial methyl groups?

What is the correct assignment of common names for the following molecules?

Which of the following substituted cyclohexanes has the most negative value of Δ\DeltaΔ G ∘\circ∘ for ring flipping from the conformation in which the substituent is axial to the one where it is equatorial?

Which of the following Newman projections does not represent 2-methylhexane?

What is the correct assignment of common names for the following molecules?

What is the approximate C-C-C bond angle in propane?

What is the IUPAC name of the following compound?

What is the IUPAC name of the following compound?

What is the approximate dihedral angle between the two chlorine atoms in the diequatorial conformation of trans-1,2-dichlorocyclohexane?

Covalent Bonding and Shapes of Molecules

Stereoisomerism and Chirality

Acids and Bases

Alkenes: Bonding, Nomenclature, and Properties

Reactions of Alkenes

Alkynes

Haloalkanes, Halogenation, and Radical Reactions

Nucleophilic Substitution and Beta-Elimination

Alcohols

Ethers, Epoxides, and Sulfides

Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Mass Spectrometry

An Introduction to Organometallic Compounds

Aldehydes and Ketones

Carboxylic Acids

Functional Derivatives of Carboxylic Acids

Enolate Anions and Enamines

Dienes, Conjugated Systems, and Pericyclic Reactions

Benzene and the Concept of Aromaticity

Reactions of Benzene and Its Derivatives

Amines

Catalytic Carbon-Carbon Bond Formation

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids

Organic Polymer Chemistry

Filters

How many constitutional isomers are there with the molecular formula C₅H₁₂?

Which of the following compounds has only 1^$\circ$ and 3^$\circ$carbon atoms?

Which of the following substituted cyclohexanes has the most negative value of $\Delta$ G^$\circ$ for ring flipping from the conformation in which the substituent is axial to the one where it is equatorial?