Question 1

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 D

Question 2

What is the IUPAC name for the following compound?

Accepted Answer

A) 4-Ethyl-5-methyloctane 
B) 4-Methyl-5-ethyloctane 
C) 4-Methyl-3-propylheptane 
D) 4-Methyl-5-propyloctane 
A) 4-Ethyl-5-methyloctane 
B) 4-Methyl-5-ethyloctane 
C) 4-Methyl-3-propylheptane 
D) 4-Methyl-5-propyloctane A

Question 3

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 B

Question 4

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

Accepted Answer

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

Question 5

What is the relation between the following pair of compounds?

Accepted Answer

A) Constitutional isomers 
B) Stereoisomers 
C) Identical molecules 
D) Not isomers of each other 
A) Constitutional isomers 
B) Stereoisomers 
C) Identical molecules 
D) Not isomers of each other

Question 6

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 7

Rank the following alkanes in order of decreasing boiling point,putting the alkane with the highest boiling point first.

Accepted Answer

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

Question 8

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 9

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 10

What is the IUPAC name for the following compound?

Accepted Answer

A) 3,5-Diethyl-6-methylheptane 
B) 3,5-Diethyl-2-methylheptane 
C) 3-Ethyl-5-isopropylheptane 
D) 5-Ethyl-3-isopropylheptane 
A) 3,5-Diethyl-6-methylheptane 
B) 3,5-Diethyl-2-methylheptane 
C) 3-Ethyl-5-isopropylheptane 
D) 5-Ethyl-3-isopropylheptane

Question 11

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

Question 12

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 13

Rank the conformers of 1,2,4-trimethylcyclohexane in order of decreasing stability,putting the most stable first.

Accepted Answer

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

Question 14

What is the IUPAC name for the following compound?

Accepted Answer

A) 1-Butyl-3-methylcyclohexane 
B) 1-sec-Butyl-3-methylcyclohexane 
C) 1-Methyl-3-sec-butylcyclohexane 
D) 1-sec-Butyl-3-methylhexane 
A) 1-Butyl-3-methylcyclohexane 
B) 1-sec-Butyl-3-methylcyclohexane 
C) 1-Methyl-3-sec-butylcyclohexane 
D) 1-sec-Butyl-3-methylhexane

Question 15

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 16

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 17

What is the IUPAC name for the following compound?

Accepted Answer

A) 1-Butylcyclohexane 
B) Cyclohexanebutane 
C) 1-Cyclohexylbutane 
D) Butylcyclohexane 
A) 1-Butylcyclohexane 
B) Cyclohexanebutane 
C) 1-Cyclohexylbutane 
D) Butylcyclohexane

Question 18

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 19

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 20

Which of the following statements about alkanes is true?

Accepted Answer

A) Alkanes are aliphatic hydrocarbons having only C-C and C-H p 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 the general molecular formula CnH2n. 
A) Alkanes are aliphatic hydrocarbons having only C-C and C-H p 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 the general molecular formula CnH2n.

Exam 4: Alkanes

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

What is the IUPAC name for the following compound?

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

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

What is the relation between the following pair of compounds?

Which of the following are gauche conformers?

Rank the following alkanes in order of decreasing boiling point,putting the alkane with the highest boiling point first.

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

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

What is the IUPAC name for the following compound?

What is the IUPAC name for the following compound?

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

Rank the conformers of 1,2,4-trimethylcyclohexane in order of decreasing stability,putting the most stable first.

What is the IUPAC name for the following compound?

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?

What is the IUPAC name for the following compound?

What is the IUPAC name for the following compound?

Which of the following statements about alkanes is true?

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 Related Compounds

Alkenes and Addition Reactions

Alkynes and Synthesis

Oxidation and Reduction

Radical Reactions

Conjugation, resonance, and Dienes

Benzene and Aromatic Compounds

Reactions of Aromatic Compounds

Introduction to Carbonyl Chemistry; Organometallic Reagents; Oxidation and Reduction

Aldehydes and Ketones - Nucleophilic Addition

Carboxylic Acids and the Acidity of the O-H Bond

Carboxylic Acids and Their Derivatives - Nucleophilic Acyl Substitution

Substitution Reactions of Carbonyl Compounds at the a Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond-Forming Reactions in Organic Synthesis

Pericyclic Reactions

Carbohydrates

Amino Acids and Proteins

Synthetic Polymers

Lipids

Molecular Ion Peaks and Fragmentation Patterns

Analyzing Molecular Motion and Infrared Spectroscopy

Organic Spectroscopy Concepts

Filters

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

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