Question 1

Which of the following is TRUE regarding stereoisomers?

Accepted Answer

A) Stereoisomers differ in the way atoms are connected but have identical spatial orientation of atoms.They can be conformational or configurational. 
B) Stereoisomers differ in the way atoms are connected but have identical spatial orientation of atoms.They can be constitutional or configurational. 
C) Stereoisomers have the same atom connectivity but have different spatial orientation of atoms.They can be constitutional or enantiomeric. 
D) Stereoisomers have the same atom connectivity but have different spatial orientation of atoms.They can be conformational or configurational. 
E) Stereoisomers have the same atom connectivity but have different functional groups on the same positions of the carbon backbone.They can be conformational or configurational. 
A) Stereoisomers differ in the way atoms are connected but have identical spatial orientation of atoms.They can be conformational or configurational. 
B) Stereoisomers differ in the way atoms are connected but have identical spatial orientation of atoms.They can be constitutional or configurational. 
C) Stereoisomers have the same atom connectivity but have different spatial orientation of atoms.They can be constitutional or enantiomeric. 
D) Stereoisomers have the same atom connectivity but have different spatial orientation of atoms.They can be conformational or configurational. 
E) Stereoisomers have the same atom connectivity but have different functional groups on the same positions of the carbon backbone.They can be conformational or configurational.

Question 2

Which of the following pairs are constitutional isomers?

Accepted Answer

A) CH3CH=CHCH2OH and CH3CH=CHOCH3 
B) ClCH2CH2CH2CH3 and CH3CH2CH2CH2Cl 
C) CH3CH(OH)CH2CH3 and CH3CH2(HO)CHCH3 
D) H2NCH2CH=CHCOOH and HOOCCH=CH(H2N)CH2 
E) CH3OCH2CH2CH2CH3 and CH3OCH2CH2CH2OCH3 
A) CH3CH=CHCH2OH and CH3CH=CHOCH3 
B) ClCH2CH2CH2CH3 and CH3CH2CH2CH2Cl 
C) CH3CH(OH)CH2CH3 and CH3CH2(HO)CHCH3 
D) H2NCH2CH=CHCOOH and HOOCCH=CH(H2N)CH2 
E) CH3OCH2CH2CH2CH3 and CH3OCH2CH2CH2OCH3

Question 3

Which of the following structures shows an E alkene isomer?

Accepted Answer

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

Question 4

Which of the following statements is TRUE?

Accepted Answer

A) Organic halides are polar molecules with C-X bond polarity increasing in order C-I < C-Br < C-Cl < C-F. 
B) Alkenes are hydrocarbons that contain one or more C=C bonds and therefore must have some carbons sp hybridized. 
C) Amines are organic compounds that contain nitrogen and have R-C(=O)-NH-R as their general formula. 
D) Esters are a family of organic compounds that contain oxygen and have the general formula R-O-R. 
E) Because alcohols contain nonpolar C-H bonds,they cannot mix with water. 
A) Organic halides are polar molecules with C-X bond polarity increasing in order C-I < C-Br < C-Cl < C-F. 
B) Alkenes are hydrocarbons that contain one or more C=C bonds and therefore must have some carbons sp hybridized. 
C) Amines are organic compounds that contain nitrogen and have R-C(=O)-NH-R as their general formula. 
D) Esters are a family of organic compounds that contain oxygen and have the general formula R-O-R. 
E) Because alcohols contain nonpolar C-H bonds,they cannot mix with water.

Question 5

What is the difference between primary,secondary,and tertiary amines?

Accepted Answer

Amines can be considered a derivative of

Question 6

Which of the following structures is S-2-chlorobutane?

Accepted Answer

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

Question 7

Which of the following molecules is the least polar?

Accepted Answer

A) butane 
B) acetic acid 
C) ethylamine 
D) methanol 
E) cyclohexanone 
A) butane 
B) acetic acid 
C) ethylamine 
D) methanol 
E) cyclohexanone

Question 8

Which of the following compounds is an aldehyde?

Accepted Answer

A) CH3CH2CH=O 
B) CH3CH2CH2CO2H 
C) CH3CO2CH3 
D) CH3-O-CH3 
E) CH2OH-CH2OH 
A) CH3CH2CH=O 
B) CH3CH2CH2CO2H 
C) CH3CO2CH3 
D) CH3-O-CH3 
E) CH2OH-CH2OH

Question 9

Which of the following compounds is an amine?

Accepted Answer

A) (CH3CH2)2NH 
B) CH3CH2CH2CH2CO2CH3 
C) CH3CH2CH2CH2-O-CH2CH2CH3 
D) CH3CH=O 
E) CH3COCH3 
A) (CH3CH2)2NH 
B) CH3CH2CH2CH2CO2CH3 
C) CH3CH2CH2CH2-O-CH2CH2CH3 
D) CH3CH=O 
E) CH3COCH3

Question 10

Which of the following compounds exhibit optical isomerism?

Accepted Answer

A) sec-butylbenzene 
B) CH2Cl2 
C) CF2BrI 
D) CHBr2I 
E) tert-butylbenzene 
A) sec-butylbenzene 
B) CH2Cl2 
C) CF2BrI 
D) CHBr2I 
E) tert-butylbenzene

Question 11

Which of the following compounds is a carboxylic acid?

Accepted Answer

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

Question 12

Which of the following compounds is chiral?

Accepted Answer

A) 3-methylhexane 
B) 3-ethylhexane 
C) 2-methylhexane 
D) 4-ethylheptane 
E) 3-ethylpentane 
A) 3-methylhexane 
B) 3-ethylhexane 
C) 2-methylhexane 
D) 4-ethylheptane 
E) 3-ethylpentane

Question 13

Which of the following statements is TRUE?

Accepted Answer

A) Enantiomers are molecules that are nonsuperimposable mirror images of each other and they have a chiral sp2 carbon atom with four different substituents in a tetrahedral arrangement. 
B) Enantiomers are molecules that are nonsuperimposable mirror images of each other and they have a prochiral carbon atom with four different substituents in a tetrahedral arrangement. 
C) Enantiomers are molecules that are superimposable mirror images of each other and they have a chiral carbon atom with four different substituents in a tetrahedral arrangement. 
D) Enantiomers are molecules that are nonsuperimposable mirror images of each other and they have a chiral carbon atom with four different substituents in a planar arrangement. 
E) Enantiomers are molecules that are nonsuperimposable mirror images of each other and they have a chiral carbon atom with four different substituents in a tetrahedral arrangement. 
A) Enantiomers are molecules that are nonsuperimposable mirror images of each other and they have a chiral sp2 carbon atom with four different substituents in a tetrahedral arrangement. 
B) Enantiomers are molecules that are nonsuperimposable mirror images of each other and they have a prochiral carbon atom with four different substituents in a tetrahedral arrangement. 
C) Enantiomers are molecules that are superimposable mirror images of each other and they have a chiral carbon atom with four different substituents in a tetrahedral arrangement. 
D) Enantiomers are molecules that are nonsuperimposable mirror images of each other and they have a chiral carbon atom with four different substituents in a planar arrangement. 
E) Enantiomers are molecules that are nonsuperimposable mirror images of each other and they have a chiral carbon atom with four different substituents in a tetrahedral arrangement.

Question 14

Find the correct statement about cis-trans isomers.

Accepted Answer

A) Cis-trans isomers are diastereomers and occur because the rotation around a C≡C bond is very restricted. 
B) Cis-trans isomers are enantiomers and occur because the rotation around a C=C bond is very restricted. 
C) Cis-trans isomers are diastereomers and occur because the rotation around a C=C bond is very restricted. 
D) Cis-trans isomers are superimposable constitutional isomers of substituted alkenes formed around a C=C bond. 
E) Cis-trans isomers are chiral molecules and occur because the rotation around a C=C bond is very restricted. 
A) Cis-trans isomers are diastereomers and occur because the rotation around a C≡C bond is very restricted. 
B) Cis-trans isomers are enantiomers and occur because the rotation around a C=C bond is very restricted. 
C) Cis-trans isomers are diastereomers and occur because the rotation around a C=C bond is very restricted. 
D) Cis-trans isomers are superimposable constitutional isomers of substituted alkenes formed around a C=C bond. 
E) Cis-trans isomers are chiral molecules and occur because the rotation around a C=C bond is very restricted.

Question 15

Which of the following lists the substituents in the order of priority,from highest (priority 1)to lowest (priority 4)?

Accepted Answer

A) -NH2,-C(=O)H,-COOH,-CH3 
B) -CH3,-COOH,-C(=O)H,-NH2 
C) -NH2,-CH3,-C(=O)H,-COOH 
D) -NH2,-COOH,-C(=O)H,-CH3 
E) -NH2,-CH3,-COOH,-C(=O)H 
A) -NH2,-C(=O)H,-COOH,-CH3 
B) -CH3,-COOH,-C(=O)H,-NH2 
C) -NH2,-CH3,-C(=O)H,-COOH 
D) -NH2,-COOH,-C(=O)H,-CH3 
E) -NH2,-CH3,-COOH,-C(=O)H

Question 16

Which two functional groups combined give the functional group found in carboxylic acids?

Accepted Answer

A) carbonyl and hydroxyl 
B) carbonyl and amine 
C) ether and hydroxyl 
D) ester and hydroxyl 
E) chlorido and carbonyl 
A) carbonyl and hydroxyl 
B) carbonyl and amine 
C) ether and hydroxyl 
D) ester and hydroxyl 
E) chlorido and carbonyl

Question 17

Identify the generic formula for alkenes.

Accepted Answer

A) CnH2n+2 
B) CnH2n-2 
C) CnH2n 
D) CnH2n-4 
E) CnH2n+4 
A) CnH2n+2 
B) CnH2n-2 
C) CnH2n 
D) CnH2n-4 
E) CnH2n+4

Question 18

The general formula for alkanes is CnH2n+2.What is the value of n in 3-ethyl-2-methylpentane ? Is this molecule chiral?

Accepted Answer

A) n = 7; yes,it is chiral 
B) n = 7; no,it is not chiral 
C) n = 8; yes,it is chiral 
D) n = 8; no,it is not chiral 
E) n = 5; yes,it is chiral 
A) n = 7; yes,it is chiral 
B) n = 7; no,it is not chiral 
C) n = 8; yes,it is chiral 
D) n = 8; no,it is not chiral 
E) n = 5; yes,it is chiral

Question 19

Which of the following statements is TRUE?

Accepted Answer

A) A common reference compound for 1H and 13C NMR is tetramethylsilane. 
B) Nuclear magnetic resonance spectroscopy uses the fact that some atomic nuclei,such as 1H and 13C,have two nuclear spin states with different energies when exposed to a high potential difference. 
C) The energy difference between two nuclear spin states corresponds to the energy of photons in the microwave part of the electromagnetic spectrum. 
D) The energy difference between two nuclear spin states depends on the number of protons and neutrons in the atomic nucleus. 
E) The difference in absorption frequency of a nucleus outside the magnetic field and a nucleus inside the external magnetic field is called the chemical shift. 
A) A common reference compound for 1H and 13C NMR is tetramethylsilane. 
B) Nuclear magnetic resonance spectroscopy uses the fact that some atomic nuclei,such as 1H and 13C,have two nuclear spin states with different energies when exposed to a high potential difference. 
C) The energy difference between two nuclear spin states corresponds to the energy of photons in the microwave part of the electromagnetic spectrum. 
D) The energy difference between two nuclear spin states depends on the number of protons and neutrons in the atomic nucleus. 
E) The difference in absorption frequency of a nucleus outside the magnetic field and a nucleus inside the external magnetic field is called the chemical shift.

Question 20

What is the index of hydrogen deficiency?

Accepted Answer

The index of hydrogen deficien

Exam 20: Organic Chemistry I: Structures

Which of the following is TRUE regarding stereoisomers?

Which of the following pairs are constitutional isomers?

Which of the following structures shows an E alkene isomer?

Which of the following statements is TRUE?

What is the difference between primary,secondary,and tertiary amines?

Which of the following structures is S-2-chlorobutane?

Which of the following molecules is the least polar?

Which of the following compounds is an aldehyde?

Which of the following compounds is an amine?

Which of the following compounds exhibit optical isomerism?

Which of the following compounds is a carboxylic acid?

Which of the following compounds is chiral?

Which of the following statements is TRUE?

Find the correct statement about cis-trans isomers.

Which of the following lists the substituents in the order of priority,from highest (priority 1)to lowest (priority 4)?

Which two functional groups combined give the functional group found in carboxylic acids?

Identify the generic formula for alkenes.

The general formula for alkanes is CnH2n+2.What is the value of n in 3-ethyl-2-methylpentane ? Is this molecule chiral?

Which of the following statements is TRUE?

What is the index of hydrogen deficiency?

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Molecules,compounds,and Nomenclature

Chemical Reactions and Stoichiometry

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, valence Bond Theory, and Molecular Orbital Theory

Liquids, solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry II: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

The general formula for alkanes is C_nH₂_n₊₂.What is the value of n in 3-ethyl-2-methylpentane ? Is this molecule chiral?