Question 1

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.F) B) and C)
G) A) and C)

Question 2

Give the condensed structural formula for propanone.

Accepted Answer

A)   CH3COCH3
B)   CH3CH2CHO
C)   CH3OCH2CH3
D)   CH3OCH3
E)   CH3CH2COF) A) and E)
G) C) and E)

Question 3

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.F) A) and B)
G) A) and C)

Question 4

When determining the priority of substituents is "A substituent atom of higher atomic number has higher priority over a substituent atom with lower atomic number."

Accepted Answer

A) True 
 B)False

Question 5

C3H8O has how many skeletal isomers?

Accepted Answer

A)   2
B)   4
C)   5
D)   6
E)   3F) B) and E)
G) B) and D)

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)   C3H6F) None of the above
G) D) and E)

Question 7

Which two simple functional groups make carboxyl group?

Accepted Answer

A)   Aldehyde and keto groups
B)   Aldehyde and hydroxyl groups
C)   Keto and hydroxyl groups
D)   Ester and hydroxyl groups
E)   Ester and ether groupsF) C) and E)
G) A) and E)

Question 8

Choose the INCORRECT statement.

Accepted Answer

A)   In thermal cracking large hydrocarbon molecules are broken down into smaller molecules, ideally, molecules in the gasoline range.
B)   Reforming converts straight-chain hydrocarbons into branched-chain hydrocarbons.
C)   Branched-chain hydrocarbons have higher octane numbers.
D)   Alkylation is the joining of small hydrocarbon fragments to larger molecules.
E)   Engine knocking is caused by the smooth firing of gasoline.F) B) and C)
G) C) and D)

Question 9

Which of the following structures represent the structure of trans-1-bromo-2-methylcyclohexane?

Accepted Answer

A)  
B)  
C)  
D)  
E)  F) None of the above
G) All of the above

Question 10

To produce an organic ester, one uses a carboxylic acid and a(n)  ________.

Accepted Answer

A)   alkyl halide
B)   alkane
C)   alcohol
D)   aldehyde
E)   ketoneF) C) and E)
G) A) and D)

Question 11

Give the condensed structural formula for 3-bromopentane.

Accepted Answer

A)   CH3CH2CHBrCH2CH2CH3
B)   CH3CHBrCH2CH2CH3
C)   (CH3) 3CHBrCH2CH3
D)   CH3CH2CHBrCH2CH3
E)   CH3CH2CBr3CH2CH3F) All of the above
G) C) and D)

Question 12

In the rings of heterocyclic compounds we can find one or more atoms that are not carbon atoms

Accepted Answer

A) True 
 B)False  True

Question 13

Which of the following synthetic procedures are plausible? 
I. synthesis of esters from alcohols and acids
II. synthesis of ethers from acids and alcohols
III. synthesis of amides from acids and amines
IV. synthesis of alcohols from alkanes and water
V. synthesis of aldehydes from alcohols and oxidizing agents

Accepted Answer

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

Question 14

How many noncyclic isomers including geometric isomers of C4H8 exist?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5F) A) and B)
G) A) and C) D

Question 15

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) , IV)  and V) 
E)   III) , and V) F) A) and B)
G) B) and C)

Question 16

The diol, ethylene glycol, is used extensively as an antifreeze additive in automobile radiators. What properties of ethylene glycol make it a good antifreeze?

Accepted Answer

A)   Ethylene glycol coats the radiator to prevent crystallization of ice at low temperatures.
B)   Ethylene glycol has a higher boiling point than water and is soluble in water.
C)   Ethylene glycol has a lower boiling point than water and is soluble in water.
D)   Ethylene glycol forms a film on the surface of the water to prevent ice formation in the radiator.
E)   Ethylene glycol will remain in the radiator after the water evaporates. This prevents freezing in cold climates.F) B) and C)
G) A) and E)

Question 17

If an ethyl group is substituted for one hydrogen of cyclohexane, what would be the preferred position of that ethyl substituent on the ring?

Accepted Answer

A)   axial position
B)   equatorial position
C)   chair position
D)   boat position
E)   twist boat conformationF) All of the above
G) A) and C)

Question 18

Which of the following structures represents a structure of R isomer of 1-amino-2-propanol?

Accepted Answer

A)  
B)  
C)  
D)  
E)  F) A) and D)
G) C) and E)

Question 19

Which of the following chiral compounds is(are)  R enantiomer(s) ?

Accepted Answer

A)   I
B)   II
C)   III
D)   II + III
E)   I + IIF) C) and E)
G) B) and E) C

Question 20

How many primary, secondary, tertiary and quaternary carbon atoms are there in the structure of 2,4,6-trimetylheptane?

Accepted Answer

A)   5 primary, 2 secondary, 2 tertiary and 1 quaternary carbon atoms
B)   5 primary, 3 secondary, 2 tertiary and 0 quaternary carbon atoms
C)   4 primary, 4 secondary, 2 tertiary and 0 quaternary carbon atoms
D)   4 primary, 2 secondary, 2 tertiary and 2 quaternary carbon atoms
E)   5 primary, 2 secondary, 3 tertiary and 0 quaternary carbon atomsF) A) and D)
G) B) and C)

Exam 26: Structures of Organic Compounds

Choose the INCORRECT statement.

Correct Answer
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Give the condensed structural formula for propanone.

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

Correct Answer
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When determining the priority of substituents is "A substituent atom of higher atomic number has higher priority over a substituent atom with lower atomic number."

Correct Answer
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C₃H₈O has how many skeletal isomers?

Correct Answer
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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?

Correct Answer
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Which two simple functional groups make carboxyl group?

Correct Answer
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Choose the INCORRECT statement.

Correct Answer
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Which of the following structures represent the structure of trans-1-bromo-2-methylcyclohexane?

Correct Answer
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To produce an organic ester, one uses a carboxylic acid and a(n) ________.

Correct Answer
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Give the condensed structural formula for 3-bromopentane.

Correct Answer
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In the rings of heterocyclic compounds we can find one or more atoms that are not carbon atoms

Correct Answer
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True

Correct Answer
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How many noncyclic isomers including geometric isomers of C₄H₈ exist?

Correct Answer
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D

Correct Answer
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The diol, ethylene glycol, is used extensively as an antifreeze additive in automobile radiators. What properties of ethylene glycol make it a good antifreeze?

Correct Answer
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If an ethyl group is substituted for one hydrogen of cyclohexane, what would be the preferred position of that ethyl substituent on the ring?

Correct Answer
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Which of the following structures represents a structure of R isomer of 1-amino-2-propanol?

Correct Answer
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Which of the following chiral compounds is(are) R enantiomer(s) ?

Correct Answer
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C

How many primary, secondary, tertiary and quaternary carbon atoms are there in the structure of 2,4,6-trimetylheptane?

Correct Answer
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Exam 26: Structures of Organic Compounds

Choose the INCORRECT statement.

Correct AnswerverifiedShow Answer

Give the condensed structural formula for propanone.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

When determining the priority of substituents is "A substituent atom of higher atomic number has higher priority over a substituent atom with lower atomic number."

Correct AnswerverifiedShow Answer

C3H8O has how many skeletal isomers?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

Which two simple functional groups make carboxyl group?

Correct AnswerverifiedShow Answer

Choose the INCORRECT statement.

Correct AnswerverifiedShow Answer

Which of the following structures represent the structure of trans-1-bromo-2-methylcyclohexane?

Correct AnswerverifiedShow Answer

To produce an organic ester, one uses a carboxylic acid and a(n) ________.

Correct AnswerverifiedShow Answer

Give the condensed structural formula for 3-bromopentane.

Correct AnswerverifiedShow Answer

In the rings of heterocyclic compounds we can find one or more atoms that are not carbon atoms

Correct AnswerverifiedTrue

Correct AnswerverifiedShow Answer

How many noncyclic isomers including geometric isomers of C4H8 exist?

Correct AnswerverifiedD

Correct AnswerverifiedShow Answer

The diol, ethylene glycol, is used extensively as an antifreeze additive in automobile radiators. What properties of ethylene glycol make it a good antifreeze?

Correct AnswerverifiedShow Answer

If an ethyl group is substituted for one hydrogen of cyclohexane, what would be the preferred position of that ethyl substituent on the ring?

Correct AnswerverifiedShow Answer

Which of the following structures represents a structure of R isomer of 1-amino-2-propanol?

Correct AnswerverifiedShow Answer

Which of the following chiral compounds is(are) R enantiomer(s) ?

Correct AnswerverifiedC

How many primary, secondary, tertiary and quaternary carbon atoms are there in the structure of 2,4,6-trimetylheptane?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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C₃H₈O has how many skeletal isomers?

Correct Answer
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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?

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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True

Correct Answer
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How many noncyclic isomers including geometric isomers of C₄H₈ exist?

Correct Answer
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D

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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C

Correct Answer
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