Question 1

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 2

Give the condensed structural formula for 2-butanone.

Accepted Answer

A) HCOCH2CH2CH3  
B) CH3CH2CH2CHO 
C) HCOCH2CH2CHO 
D) CH3CH2COCH2CH3  
E) CH3COCH2CH3  
A) HCOCH2CH2CH3  
B) CH3CH2CH2CHO 
C) HCOCH2CH2CHO 
D) CH3CH2COCH2CH3  
E) CH3COCH2CH3

Question 3

What are heterocyclic compounds?

Accepted Answer

A) They are cyclic compounds in which carbon has one or more substituents that are neither hydrogen or another carbon atom. 
B) They are cyclic compounds in which two or more carbon rings are connected by C-C bonds (for example biphenyl). 
C) They are cyclic compounds in which carbon ring is connected to another ring not containing carbon atoms. 
D) They are cyclic compounds in which one or more atoms are not carbon atoms. 
E) They are cyclic compounds that can have more than one stable conformation. 
A) They are cyclic compounds in which carbon has one or more substituents that are neither hydrogen or another carbon atom. 
B) They are cyclic compounds in which two or more carbon rings are connected by C-C bonds (for example biphenyl). 
C) They are cyclic compounds in which carbon ring is connected to another ring not containing carbon atoms. 
D) They are cyclic compounds in which one or more atoms are not carbon atoms. 
E) They are cyclic compounds that can have more than one stable conformation.

Question 4

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 5

Constitutional isomers have different bond connectivities,and as a consequence they have different skeletal structures.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following compounds is(are)chiral?

Accepted Answer

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

Question 7

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 8

A solid wedge line denotes a bond that sticks back behind the plane of the paper.

Accepted Answer

A) True 
 B)False

Question 9

Why does benzene have a much higher boiling point (80 °C)than hexane (69 °C),even though they have the same number of carbons?

Accepted Answer

A) Benzene has fewer hydrogens than hexane. 
B) Benzene is much more polar than hexane which enhances the attractive forces between molecules and raises the boiling point. 
C) Benzene is planar and has delocalized electron density which increases the attractive forces between molecules and raises the boiling point. 
D) Hexane has more Kekulé structures than benzene. 
E) Benzene can covalently bond to another benzene molecule which increases its boiling point. 
A) Benzene has fewer hydrogens than hexane. 
B) Benzene is much more polar than hexane which enhances the attractive forces between molecules and raises the boiling point. 
C) Benzene is planar and has delocalized electron density which increases the attractive forces between molecules and raises the boiling point. 
D) Hexane has more Kekulé structures than benzene. 
E) Benzene can covalently bond to another benzene molecule which increases its boiling point.

Question 10

Give the condensed structural formula for propanone.

Accepted Answer

A) CH3COCH3 
B) CH3CH2CHO 
C) CH3OCH2CH3  
D) CH3OCH3  
E) CH3CH2CO 
A) CH3COCH3 
B) CH3CH2CHO 
C) CH3OCH2CH3  
D) CH3OCH3  
E) CH3CH2CO

Question 11

Which one of the following molecules is the most polar?

Accepted Answer

A) butane 
B) butanoic acid 
C) cyclohexane 
D) ethanol 
A) butane 
B) butanoic acid 
C) cyclohexane 
D) ethanol

Question 12

Choose the INCORRECT statement.

Accepted Answer

A) Axial H atoms are directed above and below the cyclohexane ring. 
B) A substitution reaction typically involves a functional group replacing a hydrogen atom on a chain or ring containing molecule. 
C) A free radical is a compound with an unpaired electron. 
D) LPG is linear polymerized gas. 
E) Unsaturated usually means a double,triple or delocalized electron system is present in the molecule. 
A) Axial H atoms are directed above and below the cyclohexane ring. 
B) A substitution reaction typically involves a functional group replacing a hydrogen atom on a chain or ring containing molecule. 
C) A free radical is a compound with an unpaired electron. 
D) LPG is linear polymerized gas. 
E) Unsaturated usually means a double,triple or delocalized electron system is present in the molecule.

Question 13

Cis-trans isomerism is a type of isomerism generally known as stereoisomerism.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following classes of organic compounds and their general structural formulas have been correctly matched?
I.ester: 
 
II.aldehyde:
 
III.ketone: 
 
IV.carboxylic acid: 
 
 V.amide:

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 15

The two benzene substituents of the common analgesic shown below are considered in what relation to one another?

Accepted Answer

A) ortho 
B) para 
C) meta 
D) trans 
E) 1,3 
A) ortho 
B) para 
C) meta 
D) trans 
E) 1,3

Question 16

Define "conformation."

Accepted Answer

A) Conformations are different arrangements of bonds in space. 
B) Conformations are different structural representations of the same molecule. 
C) Conformations are different spatial arrangements one structure can have. 
D) Conformations are two enantiomers. 
E) Conformations are all possible structural isomers for a given molecular formula. 
A) Conformations are different arrangements of bonds in space. 
B) Conformations are different structural representations of the same molecule. 
C) Conformations are different spatial arrangements one structure can have. 
D) Conformations are two enantiomers. 
E) Conformations are all possible structural isomers for a given molecular formula.

Question 17

An alcohol of formula C3H8O in which there are only three different kinds of hydrogens is:

Accepted Answer

A) 2-propanol 
B) 1-propanol 
C) cyclopropanol 
D) ethanol 
E) None of the above 
A) 2-propanol 
B) 1-propanol 
C) cyclopropanol 
D) ethanol 
E) None of the above

Question 18

Choose the INCORRECT statement.

Accepted Answer

A) CH3CH2CH2CH2CH2NH2 is an amine. 
B) CH3CH2OCH2CH2CH3 is an ether. 
C) CH3CH2CH2CH2CH2OH is an alcohol. 
D) O   CH3CH2CH2CH2CH is a ketone. 
E) CH3CH2CH2CH=CH2 is an alkene. 
A) CH3CH2CH2CH2CH2NH2 is an amine. 
B) CH3CH2OCH2CH2CH3 is an ether. 
C) CH3CH2CH2CH2CH2OH is an alcohol. 
D) O   CH3CH2CH2CH2CH is a ketone. 
E) CH3CH2CH2CH=CH2 is an alkene.

Question 19

Give the name for CH3CH2CHBrCH3.

Accepted Answer

A) 2-bromobutane 
B) 3-bromobutane 
C) 2-bromopropane 
D) 3-bromopropane 
E) 3-bromylpentane 
A) 2-bromobutane 
B) 3-bromobutane 
C) 2-bromopropane 
D) 3-bromopropane 
E) 3-bromylpentane

Question 20

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

Exam 26: Structures of Organic Compounds

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

Give the condensed structural formula for 2-butanone.

What are heterocyclic compounds?

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

Constitutional isomers have different bond connectivities,and as a consequence they have different skeletal structures.

Which of the following compounds is(are)chiral?

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

A solid wedge line denotes a bond that sticks back behind the plane of the paper.

Why does benzene have a much higher boiling point (80 °C)than hexane (69 °C),even though they have the same number of carbons?

Give the condensed structural formula for propanone.

Which one of the following molecules is the most polar?

Choose the INCORRECT statement.

Cis-trans isomerism is a type of isomerism generally known as stereoisomerism.

Which of the following classes of organic compounds and their general structural formulas have been correctly matched? I.ester: II.aldehyde: III.ketone: IV.carboxylic acid: V.amide:

The two benzene substituents of the common analgesic shown below are considered in what relation to one another?

Define "conformation."

An alcohol of formula C3H8O in which there are only three different kinds of hydrogens is:

Choose the INCORRECT statement.

Give the name for CH3CH2CHBrCH3.

Reforming is:

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: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Reactions of Organic Compounds

Chemistry of the Living State

Filters

CH₃(C=O)CH₃ is a(n):

An alcohol of formula C₃H₈O in which there are only three different kinds of hydrogens is:

Give the name for CH₃CH₂CHBrCH₃.