Question 1

What is the IUPAC name for the following compound?

Accepted Answer

A)  1,4-Dimethylcyclohexane 
B)  1,3-Dimethylcyclohexane 
C)  1,3-Dimethylcyclopentane 
D)  1,4-Dimethylcyclopentane 
A)  1,4-Dimethylcyclohexane 
B)  1,3-Dimethylcyclohexane 
C)  1,3-Dimethylcyclopentane 
D)  1,4-Dimethylcyclopentane C

Question 2

Which of the following compounds has only primary and secondary carbon atoms?

Accepted Answer

A)  Pentane 
B)  2-Methylpentane 
C)  2,2-Dimethylpentane 
D)  2,3,3-Trimethylpentane 
A)  Pentane 
B)  2-Methylpentane 
C)  2,2-Dimethylpentane 
D)  2,3,3-Trimethylpentane A

Question 3

Which of the following cycloalkanes has the most angle strain?

Accepted Answer

A)  Cyclopropane 
B)  Cyclobutane 
C)  Cyclopentane 
D)  Cyclohexane 
A)  Cyclopropane 
B)  Cyclobutane 
C)  Cyclopentane 
D)  Cyclohexane A

Question 4

How many constitutional isomers are there with the molecular formula C6H14?

Accepted Answer

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

Question 5

What is the molecular formula of an alkane that has twenty-three carbon atoms?

Accepted Answer

A)  C23H46 
B)  C23H48 
C)  C23H50 
D)  C23H44 
A)  C23H46 
B)  C23H48 
C)  C23H50 
D)  C23H44

Question 6

Which of the following chair conformations represents trans-1,3-dimethylcyclohexane?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
A)  I 
B)  II 
C)  III 
D)  IV

Question 7

Which of the following statements about alkanes is not true?

Accepted Answer

A)  Alkanes are aliphatic hydrocarbons. 
B)  Alkanes contain only C-C and C-H F1F1F1S1F1F1F10 bonds. 
C)  Alkanes are acyclic or cyclic. 
D)  Acyclic alkanes have two fewer H atoms than cyclic alkanes with the same number of carbons. 
A)  Alkanes are aliphatic hydrocarbons. 
B)  Alkanes contain only C-C and C-H F1F1F1S1F1F1F10 bonds. 
C)  Alkanes are acyclic or cyclic. 
D)  Acyclic alkanes have two fewer H atoms than cyclic alkanes with the same number of carbons.

Question 8

Which of the following is the lowest energy conformer of 2,3-dimethybutane?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
A)  I 
B)  II 
C)  III 
D)  IV

Question 9

Which of the following compounds has only primary and secondary hydrogen atoms?

Accepted Answer

A)  2-Methylpentane 
B)  2,2,3-Trimethylpentane 
C)  3-Methylpentane 
D)  2,2-Dimethylpentane 
A)  2-Methylpentane 
B)  2,2,3-Trimethylpentane 
C)  3-Methylpentane 
D)  2,2-Dimethylpentane

Question 10

What is the IUPAC name for the following compound?

Accepted Answer

A)  2,3,5-Trimethylhexane 
B)  2,4,5-Triethylhexane 
C)  2,4-Diethyl-5-methylheptane 
D)  4-Ethyl-3,6-dimethyloctane 
A)  2,3,5-Trimethylhexane 
B)  2,4,5-Triethylhexane 
C)  2,4-Diethyl-5-methylheptane 
D)  4-Ethyl-3,6-dimethyloctane

Question 11

Which of the following is not a conformer of butane?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
A)  I 
B)  II 
C)  III 
D)  IV

Question 12

What is the parent chain for the following compound?

Accepted Answer

A)  Hexane 
B)  Heptane 
C)  Octane 
D)  Nonane 
A)  Hexane 
B)  Heptane 
C)  Octane 
D)  Nonane

Question 13

Which of the following compounds has primary, secondary and tertiary hydrogen atoms?

Accepted Answer

A)  Pentane 
B)  Hexane 
C)  2-Methylpentane 
D)  2,2-Dimethylpentane 
A)  Pentane 
B)  Hexane 
C)  2-Methylpentane 
D)  2,2-Dimethylpentane

Question 14

Which of the following is the most stable conformation of trans-1-isopropyl-3-methylcyclohexane?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
A)  I 
B)  II 
C)  III 
D)  IV

Question 15

Which of the following are gauche conformers?

Accepted Answer

A)  I and II 
B)  I and III 
C)  II and IV 
D)  II and III 
A)  I and II 
B)  I and III 
C)  II and IV 
D)  II and III

Question 16

Which of the following statements about the conformations of acyclic alkanes is not true?

Accepted Answer

A)  The staggered and eclipsed conformations are equally stable. 
B)  The staggered conformations are more stable than the eclipsed conformations. 
C)  An energy minimum and maximum occur every 60° as the conformation changes from staggered to eclipsed. 
D)  Conformations that are neither staggered nor eclipsed are intermediate in energy. 
A)  The staggered and eclipsed conformations are equally stable. 
B)  The staggered conformations are more stable than the eclipsed conformations. 
C)  An energy minimum and maximum occur every 60° as the conformation changes from staggered to eclipsed. 
D)  Conformations that are neither staggered nor eclipsed are intermediate in energy.

Question 17

Which of the following statements about the conformations of acyclic alkanes is true?

Accepted Answer

A)  A staggered conformation with two larger groups 180° from each other is called gauche. 
B)  Staggered conformations are at energy maxima and eclipsed conformations are energy minima. 
C)  A staggered conformation with two larger groups 60° from each other is called anti. 
D)  Gauche conformations are generally higher in energy than anti conformations. 
A)  A staggered conformation with two larger groups 180° from each other is called gauche. 
B)  Staggered conformations are at energy maxima and eclipsed conformations are energy minima. 
C)  A staggered conformation with two larger groups 60° from each other is called anti. 
D)  Gauche conformations are generally higher in energy than anti conformations.

Question 18

What is the IUPAC name for the following compound?

Accepted Answer

A)  1-sec-Butyl-4-isopropyl-2-methylcyclohexane 
B)  1-Isopropyl-3-methyl-4-sec-butylcyclohexane 
C)  4-Isopropyl-2-methyl-1-sec-butylcyclohexane 
D)  1-sec-Butyl-3-isopropyl-2-methylcyclohexane 
A)  1-sec-Butyl-4-isopropyl-2-methylcyclohexane 
B)  1-Isopropyl-3-methyl-4-sec-butylcyclohexane 
C)  4-Isopropyl-2-methyl-1-sec-butylcyclohexane 
D)  1-sec-Butyl-3-isopropyl-2-methylcyclohexane

Question 19

Which of the following statements about alkanes is true?

Accepted Answer

A)  Alkanes are aliphatic hydrocarbons having only C-C and C-H F1F1F1S1F1F1F10 bonds. 
B)  Cyclic alkanes have two fewer H atoms than acyclic alkanes with the same number of carbons. 
C)  Acyclic alkanes contain carbons joined in one or more rings. 
D)  Acyclic alkanes have general molecular formula CnH2n. 
A)  Alkanes are aliphatic hydrocarbons having only C-C and C-H F1F1F1S1F1F1F10 bonds. 
B)  Cyclic alkanes have two fewer H atoms than acyclic alkanes with the same number of carbons. 
C)  Acyclic alkanes contain carbons joined in one or more rings. 
D)  Acyclic alkanes have general molecular formula CnH2n.

Question 20

What is the IUPAC name for the following compound?

Accepted Answer

A)  2,3-Dimethyl-4-sec-butylheptane 
B)  4-sec-Butyl-2,3-dimethylheptane 
C)  3,5,6-Trimethyl-4-propylheptane 
D)  2,3,5-Trimethyl-4-propylheptane 
A)  2,3-Dimethyl-4-sec-butylheptane 
B)  4-sec-Butyl-2,3-dimethylheptane 
C)  3,5,6-Trimethyl-4-propylheptane 
D)  2,3,5-Trimethyl-4-propylheptane

Exam 4: Alkanes

What is the IUPAC name for the following compound?

Which of the following compounds has only primary and secondary carbon atoms?

Which of the following cycloalkanes has the most angle strain?

How many constitutional isomers are there with the molecular formula C6H14?

What is the molecular formula of an alkane that has twenty-three carbon atoms?

Which of the following chair conformations represents trans-1,3-dimethylcyclohexane?

Which of the following statements about alkanes is not true?

Which of the following is the lowest energy conformer of 2,3-dimethybutane?

Which of the following compounds has only primary and secondary hydrogen atoms?

What is the IUPAC name for the following compound?

Which of the following is not a conformer of butane?

What is the parent chain for the following compound?

Which of the following compounds has primary, secondary and tertiary hydrogen atoms?

Which of the following is the most stable conformation of trans-1-isopropyl-3-methylcyclohexane?

Which of the following are gauche conformers?

Which of the following statements about the conformations of acyclic alkanes is not true?

Which of the following statements about the conformations of acyclic alkanes is true?

What is the IUPAC name for the following compound?

Which of the following statements about alkanes is true?

What is the IUPAC name for the following compound?

Structure and Bonding

Acids and Bases

Introduction to Organic Molecules and Functional Groups

Stereochemistry

Understanding Organic Reactions

Alkyl Halides and Nucleophilic Substitution

Alkyl Halides and Elimination Reactions

Alcohols, Ethers and Epoxides

Alkenes

Alkynes

Oxidation and Reduction

Mass Spectrometry and Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Radical Reactions

Conjugation, Resonance, and Dienes

Benzene and Aromatic Compounds

Electrophilic Aromatic Substitution

Carboxylic Acids and the Acidity of the O-H Bond

Introduction to Carbonyl Chemistry; Organometallic Reagents; Oxidation and Reduction

Aldehydes and Ketones Nucleophilic Addition

Carboxylic Acids and Derivatives

Substitution Reactions of Carbonyl Compounds at the Alpha-Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond Forming Reactions in Organic Synthesis

Pericyclic Reactions

Carbohydrates

Amino Acids and Proteins

Lipids

Synthetic Polymers

Filters

How many constitutional isomers are there with the molecular formula C₆H₁₄?