Question 1

Which of the following will float on water?

Accepted Answer

A)  decane 
B)  hexane 
C)  octane 
D)  all of them 
A)  decane 
B)  hexane 
C)  octane 
D)  all of them

Question 2

Different conformations of an alkane are the result of which of the following?

Accepted Answer

A)  rotation around C−H bonds 
B)  rotation around C−C bonds 
C)  the existence of cyclic compounds 
D)  all of the these 
A)  rotation around C−H bonds 
B)  rotation around C−C bonds 
C)  the existence of cyclic compounds 
D)  all of the these

Question 3

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

Accepted Answer

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

Question 4

What is the name of the following compound?

Accepted Answer

A)  cis-1-ethyl-3-methylcyclohexane 
B)  cis-1-methyl-3-ethylcyclohexane 
C)  trans-1-ethyl-3-methylcyclohexane 
D)  trans-1-methyl-3-ethylcyclohexane 
A)  cis-1-ethyl-3-methylcyclohexane 
B)  cis-1-methyl-3-ethylcyclohexane 
C)  trans-1-ethyl-3-methylcyclohexane 
D)  trans-1-methyl-3-ethylcyclohexane

Question 5

Compounds which contain a carbon-carbon triple bond are classified as which of the following?

Accepted Answer

A)  alkanes 
B)  alkenes 
C)  alkynes 
D)  arenes 
A)  alkanes 
B)  alkenes 
C)  alkynes 
D)  arenes

Question 6

Which of the following is a constitutional isomer of butane, CH3(CH2)2CH3?

Accepted Answer

A)    
B)    
C)    
D)  all of these 
A)    
B)    
C)    
D)  all of these

Question 7

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

Accepted Answer

A)  1-ethyl-2-methylcyclohexane 
B)  1-ethyl-1-methylcyclohexane 
C)  both a and b 
D)  neither a nor b 
A)  1-ethyl-2-methylcyclohexane 
B)  1-ethyl-1-methylcyclohexane 
C)  both a and b 
D)  neither a nor b

Question 8

Consider the following ball and stick model.   Which of the following is correct description?

Accepted Answer

A)  1, 3, and 4 represent axial positions and 2, and 5 represent equatorial positions. 
B)  1, 3, and 4 represent equatorial positions and 2, and 5 represent axial positions. 
C)  All represent equatorial positions. 
D)  All represent axial positions. 
A)  1, 3, and 4 represent axial positions and 2, and 5 represent equatorial positions. 
B)  1, 3, and 4 represent equatorial positions and 2, and 5 represent axial positions. 
C)  All represent equatorial positions. 
D)  All represent axial positions.

Question 9

How many different constitutional isomers are there with the molecular formula C2H3Br3?

Accepted Answer

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

Question 10

Which of the following line-angle formulas represents butane?

Accepted Answer

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

Question 11

Eicosane is a 20 carbon alkane. How many hydrogen atoms are in eicosane?

Accepted Answer

A)  38 
B)  40 
C)  42 
D)  44 
A)  38 
B)  40 
C)  42 
D)  44

Question 12

How many constitutional isomers are there with the formula C6H14?

Accepted Answer

A)  4 
B)  5 
C)  6 
D)  7 
A)  4 
B)  5 
C)  6 
D)  7

Question 13

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 14

Which of the following is a correct IUPAC name?

Accepted Answer

A)  2-ethylpropane 
B)  2-ethylbutane 
C)  2-ethylpentane 
D)  None, they are all incorrect. 
A)  2-ethylpropane 
B)  2-ethylbutane 
C)  2-ethylpentane 
D)  None, they are all incorrect.

Question 15

Which of the following is true when there is a single substituent on cyclohexane?

Accepted Answer

A)  This substituent will prefer to be in the axial position. 
B)  This substituent will prefer to be in the equatorial position. 
C)  This substituent has no particular preference for either the axial or equatorial position. 
D)  The situation will vary, depending on the identity of the substituent. 
A)  This substituent will prefer to be in the axial position. 
B)  This substituent will prefer to be in the equatorial position. 
C)  This substituent has no particular preference for either the axial or equatorial position. 
D)  The situation will vary, depending on the identity of the substituent.

Question 16

What is the name given to a −CH2− group?

Accepted Answer

A)  methane 
B)  methylane 
C)  methylene 
D)  methyl 
A)  methane 
B)  methylane 
C)  methylene 
D)  methyl

Question 17

Which of the following is a liquid at room temperature and pressure?

Accepted Answer

A)  butane 
B)  ethane 
C)  propane 
D)  none of them 
A)  butane 
B)  ethane 
C)  propane 
D)  none of them

Question 18

Alkanes belong to which class of hydrocarbons?

Accepted Answer

A)  alkali 
B)  aromatic 
C)  saturated 
D)  unsaturated 
A)  alkali 
B)  aromatic 
C)  saturated 
D)  unsaturated

Question 19

Consider the following ball and stick model.   If the hydrogen atom indicated by the arrow was removed, what is the name given to this alkyl group?

Accepted Answer

A)  isopropyl 
B)  butyl 
C)  sec-butyl 
D)  tert-butyl 
A)  isopropyl 
B)  butyl 
C)  sec-butyl 
D)  tert-butyl

Question 20

Compounds found in which of the following products are removed from the bottom of the fractional distillation tower used in the refining of petroleum?

Accepted Answer

A)  asphalt 
B)  lubricating oil 
C)  fuel oil 
D)  gasoline 
A)  asphalt 
B)  lubricating oil 
C)  fuel oil 
D)  gasoline

Exam 11: Alkanes

Which of the following will float on water?

Different conformations of an alkane are the result of which of the following?

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

What is the name of the following compound?

Compounds which contain a carbon-carbon triple bond are classified as which of the following?

Which of the following is a constitutional isomer of butane, CH3(CH2)2CH3?

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

Consider the following ball and stick model. Which of the following is correct description?

How many different constitutional isomers are there with the molecular formula C2H3Br3?

Which of the following line-angle formulas represents butane?

Eicosane is a 20 carbon alkane. How many hydrogen atoms are in eicosane?

How many constitutional isomers are there with the formula C6H14?

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

Which of the following is a correct IUPAC name?

Which of the following is true when there is a single substituent on cyclohexane?

What is the name given to a −CH2− group?

Which of the following is a liquid at room temperature and pressure?

Alkanes belong to which class of hydrocarbons?

Consider the following ball and stick model. If the hydrogen atom indicated by the arrow was removed, what is the name given to this alkyl group?

Compounds found in which of the following products are removed from the bottom of the fractional distillation tower used in the refining of petroleum?

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Which of the following is a constitutional isomer of butane, CH₃(CH₂)₂CH₃?

How many different constitutional isomers are there with the molecular formula C₂H₃Br₃?

How many constitutional isomers are there with the formula C₆H₁₄?

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

What is the name given to a −CH₂− group?