Question 1

How many isomers are there for C5H12 ?

Accepted Answer

A) 3 
B) 4 
C) 5 
D) 6 
A) 3 
B) 4 
C) 5 
D) 6

Question 2

The general formula for alkanes is CnH2n+2.What is the value of n in 2,6-dimethylnonane? How many chiral centres does this molecule have?

Accepted Answer

A) n = 9; there are two chiral centres 
B) n = 9; there is one chiral centre 
C) n = 11; there are two chiral centres 
D) n = 11; there are three chiral centres 
E) n = 11; there is one chiral centre 
A) n = 9; there are two chiral centres 
B) n = 9; there is one chiral centre 
C) n = 11; there are two chiral centres 
D) n = 11; there are three chiral centres 
E) n = 11; there is one chiral centre

Question 3

Which of the following compounds is an alcohol?

Accepted Answer

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

Question 4

Identify the generic formula for alkanes.

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 5

Why are there so many more carbon compounds than the number of compounds made up of all the rest of the elements combined?

Accepted Answer

Carbon has the ability to form

Question 6

Find the correct Newman projection formula showing a staggered conformer of n-hexane.

Accepted Answer

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

Question 7

The infrared spectrum of a compound with molecular formula C6H8O has weak peaks around 1650 cm-1 and a strong peak around 1775 cm-1.What is the most likely structure of this compound?

Accepted Answer

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

Question 8

What is the difference between the R/ S designation and d/l designation of chiral compounds?

Accepted Answer

The R/S system gives the absolute config

Question 9

Which of the following statements is TRUE?

Accepted Answer

A) A common reference compound for 1H and 13C NMR is tetramethylmethane. 
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 under an applied magnetic field. 
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 tetramethylmethane. 
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 under an applied magnetic field. 
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 10

Which of the following condensed general formulas represents alcohols?

Accepted Answer

A) ROR 
B) RCOR 
C) RCHO 
D) ROH 
E) RCOOH 
A) ROR 
B) RCOR 
C) RCHO 
D) ROH 
E) RCOOH

Question 11

Which of the following condensed general formulas represents ethers?

Accepted Answer

A) ROR 
B) RCOR 
C) RCHO 
D) ROH 
E) RCOOH 
A) ROR 
B) RCOR 
C) RCHO 
D) ROH 
E) RCOOH

Question 12

Which of the following compounds exhibit cis-trans isomerism?

Accepted Answer

A) CH2=CH2 
B) CH2=CCl2 
C) CBr2=CHBr 
D) CHCl=CHCl 
E) (CH3)2C=CH-CH2CH3 
A) CH2=CH2 
B) CH2=CCl2 
C) CBr2=CHBr 
D) CHCl=CHCl 
E) (CH3)2C=CH-CH2CH3

Question 13

Which of the following compounds is an ether?

Accepted Answer

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

Question 14

What are the possible combinations of multiple bonds and rings if a compound's index of hydrogen deficiency equals 3?

Accepted Answer

A) three rings; two rings and two double bonds; one ring and two triple bonds 
B) three rings; two rings and a triple bond; one ring and two triple bonds; three triple bonds 
C) three rings; two rings and a double bond; one ring and two double bonds; one ring and one triple bond; one double bond and one triple bond 
D) three rings; two rings and a double bond; one ring and two double bonds; one ring and two triple bonds 
E) two rings; two rings and a double bond; one ring and two double bonds; one ring and one triple bond 
A) three rings; two rings and two double bonds; one ring and two triple bonds 
B) three rings; two rings and a triple bond; one ring and two triple bonds; three triple bonds 
C) three rings; two rings and a double bond; one ring and two double bonds; one ring and one triple bond; one double bond and one triple bond 
D) three rings; two rings and a double bond; one ring and two double bonds; one ring and two triple bonds 
E) two rings; two rings and a double bond; one ring and two double bonds; one ring and one triple bond

Question 15

Which of the following compounds is ethanol?

Accepted Answer

A) C2H6 
B) C2H5OH 
C) CH3CO2H 
D) CH3CO2CH3 
E) CH3-O-CH3 
A) C2H6 
B) C2H5OH 
C) CH3CO2H 
D) CH3CO2CH3 
E) CH3-O-CH3

Question 16

What is the maximum number of covalent bonds that a carbon atom can form?

Accepted Answer

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

Question 17

What are the possible combinations of multiple bonds and rings if a compound's index of hydrogen deficiency equals 2?

Accepted Answer

A) two rings; one ring and a triple bond; two triple bonds 
B) two rings and a double bond; three rings; one ring and two double bonds; two triple bonds 
C) three rings; two rings and a double bond; one ring and two double bonds; two triple bonds; one ring and one triple bond 
D) two rings; one ring and a double bond; two double bonds; one triple bond 
E) two rings; two double bonds; a ring and a triple bond; one double bond and one triple bond 
A) two rings; one ring and a triple bond; two triple bonds 
B) two rings and a double bond; three rings; one ring and two double bonds; two triple bonds 
C) three rings; two rings and a double bond; one ring and two double bonds; two triple bonds; one ring and one triple bond 
D) two rings; one ring and a double bond; two double bonds; one triple bond 
E) two rings; two double bonds; a ring and a triple bond; one double bond and one triple bond

Question 18

Which of the bold and underlined carbon atoms would be the most shielded in 13C NMR?

Accepted Answer

A) H3C-OH 
B) CH3CH2NH2 
C) HCOOH 
D) CH3CH2OCH2CH3 
E) CH3C(=O)H 
A) H3C-OH 
B) CH3CH2NH2 
C) HCOOH 
D) CH3CH2OCH2CH3 
E) CH3C(=O)H

Question 19

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

Accepted Answer

A) -CH3, -CH=CH2,-CH2CH3,-Cl 
B) -CH3,-CH2CH3, -CH=CH2,-Cl 
C) -Cl,-CH2CH3, -CH3,-CH=CH2 
D) -Cl,-CH2CH3,-CH=CH2, -CH3 
E) -Cl,-CH=CH2,-CH2CH3,-CH3 
A) -CH3, -CH=CH2,-CH2CH3,-Cl 
B) -CH3,-CH2CH3, -CH=CH2,-Cl 
C) -Cl,-CH2CH3, -CH3,-CH=CH2 
D) -Cl,-CH2CH3,-CH=CH2, -CH3 
E) -Cl,-CH=CH2,-CH2CH3,-CH3

Question 20

Which of the following alcohols has the lowest solubility in water?

Accepted Answer

A) CH3CH2OH 
B) CH3CH2CH2CH2OH 
C) CH3CH2CH2CH2CH2OH 
D) CH3CH2CH2CH2CH2CH2OH 
E) CH3CH2CH2CH2CH2CH2CH2CH2OH 
A) CH3CH2OH 
B) CH3CH2CH2CH2OH 
C) CH3CH2CH2CH2CH2OH 
D) CH3CH2CH2CH2CH2CH2OH 
E) CH3CH2CH2CH2CH2CH2CH2CH2OH

Exam 20: Organic Chemistry I: Structures

How many isomers are there for C5H12 ?

The general formula for alkanes is CnH2n+2.What is the value of n in 2,6-dimethylnonane? How many chiral centres does this molecule have?

Which of the following compounds is an alcohol?

Identify the generic formula for alkanes.

Why are there so many more carbon compounds than the number of compounds made up of all the rest of the elements combined?

Find the correct Newman projection formula showing a staggered conformer of n-hexane.

The infrared spectrum of a compound with molecular formula C6H8O has weak peaks around 1650 cm-1 and a strong peak around 1775 cm-1.What is the most likely structure of this compound?

What is the difference between the R/ S designation and d/l designation of chiral compounds?

Which of the following statements is TRUE?

Which of the following condensed general formulas represents alcohols?

Which of the following condensed general formulas represents ethers?

Which of the following compounds exhibit cis-trans isomerism?

Which of the following compounds is an ether?

What are the possible combinations of multiple bonds and rings if a compound's index of hydrogen deficiency equals 3?

Which of the following compounds is ethanol?

What is the maximum number of covalent bonds that a carbon atom can form?

What are the possible combinations of multiple bonds and rings if a compound's index of hydrogen deficiency equals 2?

Which of the bold and underlined carbon atoms would be the most shielded in 13C NMR?

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

Which of the following alcohols has the lowest solubility in water?

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

How many isomers are there for C₅H₁₂ ?

The general formula for alkanes is C_nH₂_n₊₂.What is the value of n in 2,6-dimethylnonane? How many chiral centres does this molecule have?

The infrared spectrum of a compound with molecular formula C₆H₈O has weak peaks around 1650 cm^-1 and a strong peak around 1775 cm^-1.What is the most likely structure of this compound?

Which of the bold and underlined carbon atoms would be the most shielded in ¹³C NMR?