Question 1

Which of the following is not the molecular formula of an alkane?

Accepted Answer

A)  C15H32 
B)  C19H40 
C)  C20H42 
D)  None of them, these are all alkanes. 
A)  C15H32 
B)  C19H40 
C)  C20H42 
D)  None of them, these are all alkanes.

Question 2

Which of the following reactions will consume the most oxygen?

Accepted Answer

A)  complete combustion of one mole of 2,3-dimethylhexane 
B)  complete combustion of one mole of 2,3,4-trimethylpentane 
C)  complete combustion of one mole of octane 
D)  None, they all consume the same amount of oxygen. 
A)  complete combustion of one mole of 2,3-dimethylhexane 
B)  complete combustion of one mole of 2,3,4-trimethylpentane 
C)  complete combustion of one mole of octane 
D)  None, they all consume the same amount of oxygen.

Question 3

Which of the following is a correct IUPAC name?

Accepted Answer

A)  1-methylcyclohexane 
B)  cis-1,3-dimethylcyclohexane 
C)  cis-1,1,2-trimethylcyclohexane 
D)  trans-1,1-diethylcyclobutane 
A)  1-methylcyclohexane 
B)  cis-1,3-dimethylcyclohexane 
C)  cis-1,1,2-trimethylcyclohexane 
D)  trans-1,1-diethylcyclobutane

Question 4

Which of the following statements about the conformation shown below are true?

Accepted Answer

A)  The ethyl and methyl groups are both axial. 
B)  All three alkyl substituents are equatorial. 
C)  The ethyl group is axial and the methyl group is equatorial. 
D)  The ethyl and methyl groups are both equatorial and the propyl group is axial. 
A)  The ethyl and methyl groups are both axial. 
B)  All three alkyl substituents are equatorial. 
C)  The ethyl group is axial and the methyl group is equatorial. 
D)  The ethyl and methyl groups are both equatorial and the propyl group is axial.

Question 5

What is the IUPAC name of the following compound?

Accepted Answer

A)  1-propylcyclohexane 
B)  isopropylcyclohexane 
C)  1-propylhexane 
D)  propylcyclohexane 
A)  1-propylcyclohexane 
B)  isopropylcyclohexane 
C)  1-propylhexane 
D)  propylcyclohexane

Question 6

The production of chloromethane by the reaction of methane gas with chlorine gas is an example of which type of reaction?

Accepted Answer

A)  oxidation 
B)  reduction 
C)  substitution 
D)  combustion 
A)  oxidation 
B)  reduction 
C)  substitution 
D)  combustion

Question 7

Which of the following is the most stable conformation of cyclopentane?

Accepted Answer

A)  boat 
B)  chair 
C)  envelope 
D)  twist 
A)  boat 
B)  chair 
C)  envelope 
D)  twist

Question 8

Which of the following will dissolve significantly in water?

Accepted Answer

A)  methane 
B)  octane 
C)  pentane 
D)  none of them 
A)  methane 
B)  octane 
C)  pentane 
D)  none of them

Question 9

What is the most abundant alkane present in natural gas?

Accepted Answer

A)  butane 
B)  propane 
C)  ethane 
D)  methane 
A)  butane 
B)  propane 
C)  ethane 
D)  methane

Question 10

Which of the following has the lowest melting point?

Accepted Answer

A)  decane 
B)  hexane 
C)  octane 
D)  nonane 
A)  decane 
B)  hexane 
C)  octane 
D)  nonane

Question 11

Consider the following ball and stick models.     What do these two representations have in common?

Accepted Answer

A)  dimethyl derivatives of cyclohexane 
B)  cis isomers 
C)  trans isomers of different compounds 
D)  same compound 
A)  dimethyl derivatives of cyclohexane 
B)  cis isomers 
C)  trans isomers of different compounds 
D)  same compound

Question 12

Which of the following represents the molecular formula for a noncyclic alkane?

Accepted Answer

A)  C15H30 
B)  C19H40 
C)  C20H40 
D)  all of them 
A)  C15H30 
B)  C19H40 
C)  C20H40 
D)  all of them

Question 13

The tert-butyl group is obtained by doing which of the following?

Accepted Answer

A)  removing a hydrogen atom from C-1 of butane 
B)  removing a hydrogen atom from C-2 of butane 
C)  removing a hydrogen atom from C-1 of 2-methylpropane 
D)  removing a hydrogen atom from C-2 of 2-methylpropane 
A)  removing a hydrogen atom from C-1 of butane 
B)  removing a hydrogen atom from C-2 of butane 
C)  removing a hydrogen atom from C-1 of 2-methylpropane 
D)  removing a hydrogen atom from C-2 of 2-methylpropane

Question 14

Freons have been implicated in the depletion of which of the following atmospheric gases?

Accepted Answer

A)  carbon dioxide 
B)  nitrogen 
C)  oxygen 
D)  ozone 
A)  carbon dioxide 
B)  nitrogen 
C)  oxygen 
D)  ozone

Question 15

Consider the following ball and stick model. This represents a top view of the model.   Which of the following is not equivalent representation of this compound?

Accepted Answer

A)    
B)    
C)    
D)  All are representations of the compound. 
A)    
B)    
C)    
D)  All are representations of the compound.

Question 16

On an exam, students were shown the structure of an alkane and asked to give the IUPAC name of the compound. Of the following answers which were given, which corresponds to the correct IUPAC name of a real compound?

Accepted Answer

A)  2-ethyl-2-methylbutane 
B)  2,2-dimethylbutane 
C)  2,2-diethylbutane 
D)  none of them 
A)  2-ethyl-2-methylbutane 
B)  2,2-dimethylbutane 
C)  2,2-diethylbutane 
D)  none of them

Question 17

Which of the following is the correct molecular formula for nonane?

Accepted Answer

A)  C7H16 
B)  C9H20 
C)  C11H24 
D)  none of these 
A)  C7H16 
B)  C9H20 
C)  C11H24 
D)  none of these

Question 18

Which of the following correctly describes the relationship between butane and 2-methylpropane?

Accepted Answer

A)  They have the same molecular formula. 
B)  They have the same chemical properties. 
C)  They have the same physical properties. 
D)  All of the above are true. 
A)  They have the same molecular formula. 
B)  They have the same chemical properties. 
C)  They have the same physical properties. 
D)  All of the above are true.

Question 19

Which of the following are representations of the same molecule? (i)
CH3CH2CH2CH2CH2CH2CH3(ii)   (iii)

Accepted Answer

A)  only (i) and (ii) 
B)  only (i) and (iii) 
C)  only (ii) and (iii) 
D)  none of them 
A)  only (i) and (ii) 
B)  only (i) and (iii) 
C)  only (ii) and (iii) 
D)  none of them

Question 20

Which of the following molecules can exist as cis-trans isomers?

Accepted Answer

A)  1,2-dimethylcyclobutane 
B)  1,3-dimethylcyclobutane 
C)  both a and b 
D)  neither a nor b 
A)  1,2-dimethylcyclobutane 
B)  1,3-dimethylcyclobutane 
C)  both a and b 
D)  neither a nor b

Exam 11: Alkanes

Which of the following is not the molecular formula of an alkane?

Which of the following reactions will consume the most oxygen?

Which of the following is a correct IUPAC name?

Which of the following statements about the conformation shown below are true?

What is the IUPAC name of the following compound?

The production of chloromethane by the reaction of methane gas with chlorine gas is an example of which type of reaction?

Which of the following is the most stable conformation of cyclopentane?

Which of the following will dissolve significantly in water?

What is the most abundant alkane present in natural gas?

Which of the following has the lowest melting point?

Consider the following ball and stick models. What do these two representations have in common?

Which of the following represents the molecular formula for a noncyclic alkane?

The tert-butyl group is obtained by doing which of the following?

Freons have been implicated in the depletion of which of the following atmospheric gases?

Consider the following ball and stick model. This represents a top view of the model. Which of the following is not equivalent representation of this compound?

On an exam, students were shown the structure of an alkane and asked to give the IUPAC name of the compound. Of the following answers which were given, which corresponds to the correct IUPAC name of a real compound?

Which of the following is the correct molecular formula for nonane?

Which of the following correctly describes the relationship between butane and 2-methylpropane?

Which of the following are representations of the same molecule? (i) CH3CH2CH2CH2CH2CH2CH3(ii) (iii)

Which of the following molecules can exist as cis-trans isomers?

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Which of the following are representations of the same molecule? (i) CH₃CH₂CH₂CH₂CH₂CH₂CH₃(ii) (iii)