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

Give the condensed structural formula for 3-bromopentane.

Accepted Answer

A) CH3CH2CHBrCH2CH2CH3  
B) CH3CHBrCH2CH2CH3  
C) (CH3)3CHBrCH2CH3  
D) CH3CH2CHBrCH2CH3  
E) CH3CH2CBr3CH2CH3  
A) CH3CH2CHBrCH2CH2CH3  
B) CH3CHBrCH2CH2CH3  
C) (CH3)3CHBrCH2CH3  
D) CH3CH2CHBrCH2CH3  
E) CH3CH2CBr3CH2CH3

Question 3

You found an organic compound containing chiral carbon atom with the following four substituents: HC≡C-,Cl-,O=C- and H2C=CH-.What would be the correct order of their priorities?

Accepted Answer

A) HC≡C- > O=C- > Cl- > H2C=CH- 
B) Cl- > HC≡C- > O=C- > H2C=CH- 
C) Cl- > O=C- > HC≡C- > H2C=CH- 
D) Cl- > O=C-> H2C=CH- > HC≡C- 
E) O=C- > Cl- > HC≡C- > H2C=CH- 
A) HC≡C- > O=C- > Cl- > H2C=CH- 
B) Cl- > HC≡C- > O=C- > H2C=CH- 
C) Cl- > O=C- > HC≡C- > H2C=CH- 
D) Cl- > O=C-> H2C=CH- > HC≡C- 
E) O=C- > Cl- > HC≡C- > H2C=CH-

Question 4

Which class of compounds is the least reactive?

Accepted Answer

A) ethers 
B) alcohols 
C) ketones 
D) alkyl halides 
E) aldehydes 
A) ethers 
B) alcohols 
C) ketones 
D) alkyl halides 
E) aldehydes

Question 5

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 6

Combustion of 493 mg of a hydrocarbon gave 1549 mg CO2 and 633.9 mg H2O.What is the molecular formula if the molecular weight is subsequently found to be 42?

Accepted Answer

A) CO2  
B) CH2  
C) C6H12  
D) C2H2O 
E) C3H6  
A) CO2  
B) CH2  
C) C6H12  
D) C2H2O 
E) C3H6

Question 7

What is the degree of unsaturation for the following compounds?

Accepted Answer

A) For A the degree of unsaturation is 1,for B is 6 and for C is 5. 
B) For A the degree of unsaturation is 1,for B is 5 and for C is 6. 
C) For A the degree of unsaturation is 0,for B is 6 and for C is 5. 
D) For A the degree of unsaturation is 1,for B is 6 and for C is 4. 
E) For A the degree of unsaturation is 1,for B is 4 and for C is 5. 
A) For A the degree of unsaturation is 1,for B is 6 and for C is 5. 
B) For A the degree of unsaturation is 1,for B is 5 and for C is 6. 
C) For A the degree of unsaturation is 0,for B is 6 and for C is 5. 
D) For A the degree of unsaturation is 1,for B is 6 and for C is 4. 
E) For A the degree of unsaturation is 1,for B is 4 and for C is 5.

Question 8

Give the condensed structural formula for 3-methyl-3-hexene.

Accepted Answer

A) CH3CH2CH(CH3)CH=CHCH3  
B) CH3CH2C(CH3)2CH=CHCH3  
C) (CH3)3CCH=CHCH3  
D) CH3CH2C(CH3)=CHCH2CH3  
E) (CH3)6CCH2CH=CH2  
A) CH3CH2CH(CH3)CH=CHCH3  
B) CH3CH2C(CH3)2CH=CHCH3  
C) (CH3)3CCH=CHCH3  
D) CH3CH2C(CH3)=CHCH2CH3  
E) (CH3)6CCH2CH=CH2

Question 9

Which of the following four molecules are aromatic?

Accepted Answer

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

Question 10

Calculate the degree of unsaturation for the molecule below:

Accepted Answer

A) 3 
B) 5 
C) 7 
D) 9 
E) 11 
A) 3 
B) 5 
C) 7 
D) 9 
E) 11

Question 11

Give the name for CH3CH2CH2COCH2CH3.

Accepted Answer

A) 4-hexanone 
B) 3-hexanone 
C) 3-butanone 
D) 3-hexanol 
E) 4-hexanoic acid 
A) 4-hexanone 
B) 3-hexanone 
C) 3-butanone 
D) 3-hexanol 
E) 4-hexanoic acid

Question 12

Give the condensed structural formula for 2-methylpropanoic acid.

Accepted Answer

A) (CH3)2CHCOOH 
B) (CH3)2CHCHO 
C) (CH3)2CHCH2COOH 
D) (CH3)2COOH 
E) CH3CH2COOH 
A) (CH3)2CHCOOH 
B) (CH3)2CHCHO 
C) (CH3)2CHCH2COOH 
D) (CH3)2COOH 
E) CH3CH2COOH

Question 13

Choose the best configuration assignments for the three double bonds,labeled A,B and C,in the following compound:

Accepted Answer

A) A is E,B is E,and C is E 
B) A is E,B is E,and C is Z 
C) A is Z,B is Z,and C is E 
D) A is E,B is Z,and C is E 
E) A is Z,B is E,and C is Z 
A) A is E,B is E,and C is E 
B) A is E,B is E,and C is Z 
C) A is Z,B is Z,and C is E 
D) A is E,B is Z,and C is E 
E) A is Z,B is E,and C is Z

Question 14

In alkene nomenclature "trans" stands for "on the same side" while "cis" means "across."

Accepted Answer

A) True 
 B)False

Question 15

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

Accepted Answer

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

Question 16

Find the answer that has correct both the two structures of cis-1-isopropyl-4-methylcyclohexane and their relative stability (stability is indicated with ">" meaning "more stable than").

Accepted Answer

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

Question 17

Choose the INCORRECT statement.

Accepted Answer

A) Latin prefixes provide information on the numbers of C atoms in a chain. 
B) An alkane group used as a side chain group is called an alkyl group. 
C) Di,tri,and tetra can be used to designate the number of side chain groups. 
D) Positional isomers differ in the position on the main chain of the side chain group. 
E) Functional groups are distinctive groupings of one or more atoms. 
A) Latin prefixes provide information on the numbers of C atoms in a chain. 
B) An alkane group used as a side chain group is called an alkyl group. 
C) Di,tri,and tetra can be used to designate the number of side chain groups. 
D) Positional isomers differ in the position on the main chain of the side chain group. 
E) Functional groups are distinctive groupings of one or more atoms.

Question 18

Which statements regarding chiral compounds are correct?
I."Chiral carbon" is synonymous with "asymmetric carbon."
II.The presence of one chiral carbon in a structure results in two possible enantiomers.
III.Two enantiomers can be interconverted without breaking any bonds.
IV.Two chiral molecules are mirror images of each other.
V.Two chiral molecules have significantly different chemical properties.

Accepted Answer

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

Question 19

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

Exam 26: Structures of Organic Compounds

How many isomers are there for C5H12?

Give the condensed structural formula for 3-bromopentane.

You found an organic compound containing chiral carbon atom with the following four substituents: HC≡C-,Cl-,O=C- and H2C=CH-.What would be the correct order of their priorities?

Which class of compounds is the least reactive?

Which of the following compounds is(are)chiral?

Combustion of 493 mg of a hydrocarbon gave 1549 mg CO2 and 633.9 mg H2O.What is the molecular formula if the molecular weight is subsequently found to be 42?

What is the degree of unsaturation for the following compounds?

Give the condensed structural formula for 3-methyl-3-hexene.

Which of the following four molecules are aromatic?

Calculate the degree of unsaturation for the molecule below:

Give the name for CH3CH2CH2COCH2CH3.

Give the condensed structural formula for 2-methylpropanoic acid.

Choose the best configuration assignments for the three double bonds,labeled A,B and C,in the following compound:

In alkene nomenclature "trans" stands for "on the same side" while "cis" means "across."

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

Find the answer that has correct both the two structures of cis-1-isopropyl-4-methylcyclohexane and their relative stability (stability is indicated with ">" meaning "more stable than").

Choose the INCORRECT statement.

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

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

How many isomers are there for C₅H₁₂?

You found an organic compound containing chiral carbon atom with the following four substituents: HC≡C-,Cl-,O=C- and H₂C=CH-.What would be the correct order of their priorities?

Combustion of 493 mg of a hydrocarbon gave 1549 mg CO₂ and 633.9 mg H₂O.What is the molecular formula if the molecular weight is subsequently found to be 42?

Give the name for CH₃CH₂CH₂COCH₂CH₃.