Question 1

Which of the following compounds is(are) chiral?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  I + II 
E)  II + III 
A)  I 
B)  II 
C)  III 
D)  I + II 
E)  II + III

Question 2

CH3(C=O)CH3 is a(n):

Accepted Answer

A)  ether 
B)  ketone 
C)  ester 
D)  aldehyde 
E)  carboxylic acid 
A)  ether 
B)  ketone 
C)  ester 
D)  aldehyde 
E)  carboxylic acid

Question 3

Compounds I) to V) are all cyclic compounds. How many heterocyclic compounds are among them?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 4

A Conformation is a set of all possible optical isomers of an organic compound of a given molecular formula.

Accepted Answer

A) True 
 B)False

Question 5

C4H10O has how many skeletal isomers?

Accepted Answer

A)  11 
B)  12 
C)  8 
D)  7 
E)  6 
A)  11 
B)  12 
C)  8 
D)  7 
E)  6

Question 6

How many chiral carbon atoms can you find in the molecule below?

Accepted Answer

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

Question 7

Which of the following represent two different chair forms of methylcyclohexane?

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E) 
  
A) 
  
B) 
  
C) 
  
D) 
  
E)

Question 8

Which of the following classes of organic compounds and their general structural formulas have been correctly matched? I) ester: IV) Carboxylic acid:     II) Aldehyde: V) Amide:     III) Ketone:

Accepted Answer

A)  I), II), and V) 
B)  II), III), and V) 
C)  III), IV), and V) 
D)  I), IV), and V) 
E)  II), IV), and V) 
A)  I), II), and V) 
B)  II), III), and V) 
C)  III), IV), and V) 
D)  I), IV), and V) 
E)  II), IV), and V)

Question 9

The terms ortho, meta and para are used to describe the substitution on benzene ring. What do they stand for?

Accepted Answer

A)  Ortho stands for two adjacent substituents, meta for two substituents with one carbon between them and para for two substituents with two carbon atoms between them 
B)  Ortho stands for two cis substituents, meta for two trans substituents and para for two opposite substituents. 
C)  Ortho stands for two adjacent substituents, meta for two different adjacent substituents and para for two substituents with one carbon atoms between them 
D)  Ortho stands for two substituents with one carbon atom between them, meta for two substituents with two carbons between them and para for two substituents with three carbon atoms between them 
E)  Ortho stands for two substituents with two carbon atoms between them, meta for two substituents with three carbons between them and para for two substituents with four carbon atoms between them 
A)  Ortho stands for two adjacent substituents, meta for two substituents with one carbon between them and para for two substituents with two carbon atoms between them 
B)  Ortho stands for two cis substituents, meta for two trans substituents and para for two opposite substituents. 
C)  Ortho stands for two adjacent substituents, meta for two different adjacent substituents and para for two substituents with one carbon atoms between them 
D)  Ortho stands for two substituents with one carbon atom between them, meta for two substituents with two carbons between them and para for two substituents with three carbon atoms between them 
E)  Ortho stands for two substituents with two carbon atoms between them, meta for two substituents with three carbons between them and para for two substituents with four carbon atoms between them

Question 10

Give the condensed structural formula for methyl butanoate.

Accepted Answer

A)  CH3COOCH2CH2CH2CH3 
B)  HCOOCH2CH2CH2CH3 
C)  CH3CH2CH2COOCH3. 
D)  CH3CH2CH2COOCH3 
E)  CH3CH2CH2COOH 
A)  CH3COOCH2CH2CH2CH3 
B)  HCOOCH2CH2CH2CH3 
C)  CH3CH2CH2COOCH3. 
D)  CH3CH2CH2COOCH3 
E)  CH3CH2CH2COOH

Question 11

Calculate the degree of unsaturation for the following molecules: 
Molecule I: C3H4
Molecule II: C5H10
Molecule III: C4H6

Accepted Answer

A)  For molecule I the degree of unsaturation is 2, for molecule II the degree of unsaturation is 1 and for molecule III the degree of unsaturation is 1.. 
B)  For molecule I the degree of unsaturation is 2, for molecule II the degree of unsaturation is 0 and for molecule III the degree of unsaturation is 2. 
C)  For molecule I the degree of unsaturation is 2, for molecule II the degree of unsaturation is 1 and for molecule III the degree of unsaturation is 2.. 
D)  For molecule I the degree of unsaturation is 2, for molecule II the degree of unsaturation is 2 and for molecule III the degree of unsaturation is 2.. 
E)  For molecule I the degree of unsaturation is 2, for molecule II the degree of unsaturation is 1 and for molecule III the degree of unsaturation is 1. 
A)  For molecule I the degree of unsaturation is 2, for molecule II the degree of unsaturation is 1 and for molecule III the degree of unsaturation is 1.. 
B)  For molecule I the degree of unsaturation is 2, for molecule II the degree of unsaturation is 0 and for molecule III the degree of unsaturation is 2. 
C)  For molecule I the degree of unsaturation is 2, for molecule II the degree of unsaturation is 1 and for molecule III the degree of unsaturation is 2.. 
D)  For molecule I the degree of unsaturation is 2, for molecule II the degree of unsaturation is 2 and for molecule III the degree of unsaturation is 2.. 
E)  For molecule I the degree of unsaturation is 2, for molecule II the degree of unsaturation is 1 and for molecule III the degree of unsaturation is 1.

Question 12

Torsional or rotational energy is the difference in energy between the eclipsed and staggered conformations in alkane structure

Accepted Answer

A) True 
 B)False

Question 13

Provide IUPAC names for the following compounds:

Accepted Answer

A)  A is (3S)-3-bromo-2,3-dimethylpentane, B is (2S)-1,2-dibromopentane and C is (3R)-3-fluoro-3-methylhexane 
B)  A is (3R)-3-bromo-2,3-dimethylpentane, B is (2S)-1,2-dibromopentane and C is (3R)-3-fluoro-3-methylhexane 
C)  A is (3S)-3-bromo-2,3-dimethylpentane, B is (2R)-1,2-dibromopentane and C is (3R)-3-fluoro-3-methylhexane 
D)  A is (3S)-3-bromo-2,3-dimethylpentane, B is (2S)-1,2-dibromopentane and C is (3S)-3-fluoro-3-methylhexane 
E)  A is (3R)-3-bromo-2,3-dimethylpentane, B is (2S)-1,2-dibromopentane and C is (3S)-3-fluoro-3-methylhexane 
A)  A is (3S)-3-bromo-2,3-dimethylpentane, B is (2S)-1,2-dibromopentane and C is (3R)-3-fluoro-3-methylhexane 
B)  A is (3R)-3-bromo-2,3-dimethylpentane, B is (2S)-1,2-dibromopentane and C is (3R)-3-fluoro-3-methylhexane 
C)  A is (3S)-3-bromo-2,3-dimethylpentane, B is (2R)-1,2-dibromopentane and C is (3R)-3-fluoro-3-methylhexane 
D)  A is (3S)-3-bromo-2,3-dimethylpentane, B is (2S)-1,2-dibromopentane and C is (3S)-3-fluoro-3-methylhexane 
E)  A is (3R)-3-bromo-2,3-dimethylpentane, B is (2S)-1,2-dibromopentane and C is (3S)-3-fluoro-3-methylhexane

Question 14

Give the name for HCOOH.

Accepted Answer

A)  methanone alcohol 
B)  methanal alcohol 
C)  ethanoic or acetic acid 
D)  methanaldehyde 
E)  methanoic or formic acid 
A)  methanone alcohol 
B)  methanal alcohol 
C)  ethanoic or acetic acid 
D)  methanaldehyde 
E)  methanoic or formic acid

Question 15

What is the condensed structural formula for 2-pentyne?

Accepted Answer

A)  CH2≡CHCH2CH2CH3 
B)  CH3C≡CCH2CH3 
C)  CH3CH≡CHCH2CH3 
D)  CH3C≡CCH3 
E)  CH3CH≡CCH2CH2CH3 
A)  CH2≡CHCH2CH2CH3 
B)  CH3C≡CCH2CH3 
C)  CH3CH≡CHCH2CH3 
D)  CH3C≡CCH3 
E)  CH3CH≡CCH2CH2CH3

Question 16

Provide names for compounds A, B and C:

Accepted Answer

A)  A is 3-chloro-4-methylpentanal, B is meta-chlorophenol and C is 3-(2-methylcyclohexyl)cyclopentanecarboxylic acid 
B)  A is 3-chloro-4-methylpentanol, B is meta-chlorophenol and C is 3-(2-methylcyclohexyl)cyclopentanecarboxylic acid 
C)  A is 3-chloro-4-methylpentanal, B is ortho-chlorophenol and C is 3-(3-methylcyclohexyl)cyclopentanecarboxylic acid 
D)  A is 3-chloro-4-methylpentanon, B is meta-chlorophenol and C is 3-(2-methylcyclohexyl)cyclopentanal 
E)  A is 4-chloro-3-methylpentanal, B is para-chlorophenol and C is 3-(2-methylcyclohexyl)cyclopentanecarboxylic acid 
A)  A is 3-chloro-4-methylpentanal, B is meta-chlorophenol and C is 3-(2-methylcyclohexyl)cyclopentanecarboxylic acid 
B)  A is 3-chloro-4-methylpentanol, B is meta-chlorophenol and C is 3-(2-methylcyclohexyl)cyclopentanecarboxylic acid 
C)  A is 3-chloro-4-methylpentanal, B is ortho-chlorophenol and C is 3-(3-methylcyclohexyl)cyclopentanecarboxylic acid 
D)  A is 3-chloro-4-methylpentanon, B is meta-chlorophenol and C is 3-(2-methylcyclohexyl)cyclopentanal 
E)  A is 4-chloro-3-methylpentanal, B is para-chlorophenol and C is 3-(2-methylcyclohexyl)cyclopentanecarboxylic acid

Question 17

The compound with formula C4H9N has two degrees of unsaturation.

Accepted Answer

A) True 
 B)False

Question 18

Name the following compound: CH3CH2NHCH3.

Accepted Answer

A)  aminopropane 
B)  aminomethylethane 
C)  methylaminoethane 
D)  propylamine 
E)  ethylmethylamine 
A)  aminopropane 
B)  aminomethylethane 
C)  methylaminoethane 
D)  propylamine 
E)  ethylmethylamine

Question 19

Reforming is:

Accepted Answer

A)  a process that joins low molecular mass hydrocarbons into higher molecular mass hydrocarbons 
B)  a process that converts straight chain hydrocarbons to branched hydrocarbons 
C)  a process that converts unsaturated organic compounds to saturated ones 
D)  a process that breaks down high molecular mass hydrocarbons into low molecular mass hydrocarbons 
E)  a process that converts branched hydrocarbons to straight chain hydrocarbons 
A)  a process that joins low molecular mass hydrocarbons into higher molecular mass hydrocarbons 
B)  a process that converts straight chain hydrocarbons to branched hydrocarbons 
C)  a process that converts unsaturated organic compounds to saturated ones 
D)  a process that breaks down high molecular mass hydrocarbons into low molecular mass hydrocarbons 
E)  a process that converts branched hydrocarbons to straight chain hydrocarbons

Question 20

Which of the following compounds is(are) E configuration(s)?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  I + II 
E)  II + III 
A)  I 
B)  II 
C)  III 
D)  I + II 
E)  II + III

Exam 26: Structures of Organic Compounds

Which of the following compounds is(are) chiral?

CH3(C=O)CH3 is a(n):

Compounds I) to V) are all cyclic compounds. How many heterocyclic compounds are among them?

A Conformation is a set of all possible optical isomers of an organic compound of a given molecular formula.

C4H10O has how many skeletal isomers?

How many chiral carbon atoms can you find in the molecule below?

Which of the following represent two different chair forms of methylcyclohexane?

Which of the following classes of organic compounds and their general structural formulas have been correctly matched? I) ester: IV) Carboxylic acid: II) Aldehyde: V) Amide: III) Ketone:

The terms ortho, meta and para are used to describe the substitution on benzene ring. What do they stand for?

Give the condensed structural formula for methyl butanoate.

Calculate the degree of unsaturation for the following molecules: Molecule I: C3H4 Molecule II: C5H10 Molecule III: C4H6

Torsional or rotational energy is the difference in energy between the eclipsed and staggered conformations in alkane structure

Provide IUPAC names for the following compounds:

Give the name for HCOOH.

What is the condensed structural formula for 2-pentyne?

Provide names for compounds A, B and C:

The compound with formula C4H9N has two degrees of unsaturation.

Name the following compound: CH3CH2NHCH3.

Reforming is:

Which of the following compounds is(are) E configuration(s)?

Matter - Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Additional Aspects

Intermolecular Forces: Liquids and Solids

Solutions and Their Physical Properties

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements I: Groups 1, 2, 13, and 14

Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry 1-41

Reactions of Organic Compounds

Chemistry of the Living State

Filters

CH₃(C=O)CH₃ is a(n):

Calculate the degree of unsaturation for the following molecules: Molecule I: C₃H₄ Molecule II: C₅H₁₀ Molecule III: C₄H₆

The compound with formula C₄H₉N has two degrees of unsaturation.

Name the following compound: CH₃CH₂NHCH₃.