Question 1

The minimum number of carbon atoms required to form a branched-chain alkane and a branched-chain alkyl group are, respectively,

Accepted Answer

A)  three and three. 
B)  four and four. 
C)  three and four. 
D)  four and three. 
A)  three and three. 
B)  four and four. 
C)  three and four. 
D)  four and three. D

Question 2

The distinction between a saturated hydrocarbon and an unsaturated hydrocarbon relates to

Accepted Answer

A)  boiling points 
B)  volatility 
C)  number of carbon atoms present 
D)  the number of multiple bonds present in the molecule 
A)  boiling points 
B)  volatility 
C)  number of carbon atoms present 
D)  the number of multiple bonds present in the molecule D

Question 3

For the pair of compounds, select a correct characterization from the response list: cyclohexane and methylcyclopentane.

Accepted Answer

A)  are constitutional isomers 
B)  have the same number of carbon atoms but are not constitutional isomers 
C)  both exist in cis-trans forms 
D)  one but not the other exists in cis-trans forms 
A)  are constitutional isomers 
B)  have the same number of carbon atoms but are not constitutional isomers 
C)  both exist in cis-trans forms 
D)  one but not the other exists in cis-trans forms A

Question 4

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: (1) The names propyl bromide and 1-bromopropane denote the same compound.
(2) Compounds with the molecular formula C5H10 are alkanes and those with the formula C5H12 are cycloalkanes.
(3) Alkanes readily undergo combustion when ignited to form H2 gas and elemental carbon.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Question 5

Constitutional isomerism is possible in alkanes only if the number of carbon atoms present is

Accepted Answer

A)  four or more 
B)  five or more 
C)  an even number 
D)  an odd number 
A)  four or more 
B)  five or more 
C)  an even number 
D)  an odd number

Question 6

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: (1) Cis-trans isomers have the same molecular formula and also the same structural formula.
(2) Molecules of the compound 1,3-dichlorocyclohexane contain 12 hydrogen atoms.
(3) The product from the reaction of one molecule of ethane with one molecule of Br2 is 1,2-dibromoethane.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Question 7

How many hydrogen atoms are present in the molecule 2,5-dimethyloctane

Accepted Answer

A)  18 
B)  20 
C)  22 
D)  24 
A)  18 
B)  20 
C)  22 
D)  24

Question 8

From the response list, select the correct molecular formula for 1,2-dimethylcyclobutane.

Accepted Answer

A)  C6H12 
B)  C6H14 
C)  C8H16 
D)  C8H18 
A)  C6H12 
B)  C6H14 
C)  C8H16 
D)  C8H18

Question 9

From the response list, select the correct molecular formula for cyclohexane.

Accepted Answer

A)  C6H12 
B)  C6H14 
C)  C8H16 
D)  C8H18 
A)  C6H12 
B)  C6H14 
C)  C8H16 
D)  C8H18

Question 10

In which of the following alkanes are 13 covalent bonds present?

Accepted Answer

A)    
B)    
C)    
D)  more than one correct response 
E)  no correct response 
A)    
B)    
C)    
D)  more than one correct response 
E)  no correct response

Question 11

Which of the following is a general physical property of alkanes?

Accepted Answer

A)  Low solubility in water. 
B)  Less volatile than water. 
C)  More dense than water. 
D)  More polar than water. 
A)  Low solubility in water. 
B)  Less volatile than water. 
C)  More dense than water. 
D)  More polar than water.

Question 12

What is the common name for the halogenated hydrocarbon whose IUPAC name is 2-chloropropane?

Accepted Answer

A)  sec-propyl chloride 
B)  ethyl chloride 
C)  propyl chloride 
D)  isopropyl chloride 
A)  sec-propyl chloride 
B)  ethyl chloride 
C)  propyl chloride 
D)  isopropyl chloride

Question 13

Which of the following alkanes has the IUPAC name 2-methylbutane?

Accepted Answer

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

Question 14

The four hydrogen atoms bonded to the central carbon atom in methane lie at the corners or apexes of a

Accepted Answer

A)  rectangle 
B)  tetrahedron 
C)  square 
D)  parallelogram 
A)  rectangle 
B)  tetrahedron 
C)  square 
D)  parallelogram

Question 15

Which of the following statements concerning organic compounds is correct?

Accepted Answer

A)  Organic compounds are found only in non-living systems. 
B)  Organic compounds are always soluble in water. 
C)  Organic compounds cannot be found in nature; they must be synthesized in a laboratory. 
D)  Organic compounds always contain the element carbon. 
A)  Organic compounds are found only in non-living systems. 
B)  Organic compounds are always soluble in water. 
C)  Organic compounds cannot be found in nature; they must be synthesized in a laboratory. 
D)  Organic compounds always contain the element carbon.

Question 16

Select from the response list a compound that has two substituents present.

Accepted Answer

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

Question 17

From the response list, select the correct number of constitutional isomers that exist for dichlorocyclopentanes.

Accepted Answer

A)  two 
B)  three 
C)  four 
D)  five 
A)  two 
B)  three 
C)  four 
D)  five

Question 18

Which of the following cycloalkanes or cycloalkane derivatives contains 10 hydrogen atoms?

Accepted Answer

A)  methylcyclobutane 
B)  1,2-dimethylcyclobutane 
C)  1,2-dichlorocyclohexane 
D)  more than one correct response 
E)  no correct response 
A)  methylcyclobutane 
B)  1,2-dimethylcyclobutane 
C)  1,2-dichlorocyclohexane 
D)  more than one correct response 
E)  no correct response

Question 19

There are three 5-carbon alkane constitutional isomers. Their molecular formulas are, respectively,

Accepted Answer

A)  C5H11, C5H12, C5H13 
B)  C5H10, C5H12, C5H14 
C)  C5H12, C5H13, C5H14 
D)  C5H12, C5H12, C5H12 
A)  C5H11, C5H12, C5H13 
B)  C5H10, C5H12, C5H14 
C)  C5H12, C5H13, C5H14 
D)  C5H12, C5H12, C5H12

Question 20

Which of the following compounds is a constitutional isomer of CH3-CH2-CH2-CH2-CH3?

Accepted Answer

A)  2-methylpentane 
B)  2-methylbutane 
C)  2,2-dimethylbutane 
D)  more than one correct response 
E)  no correct response 
A)  2-methylpentane 
B)  2-methylbutane 
C)  2,2-dimethylbutane 
D)  more than one correct response 
E)  no correct response

Exam 12: Saturated Hydrocarbons

The minimum number of carbon atoms required to form a branched-chain alkane and a branched-chain alkyl group are, respectively,

The distinction between a saturated hydrocarbon and an unsaturated hydrocarbon relates to

For the pair of compounds, select a correct characterization from the response list: cyclohexane and methylcyclopentane.

Constitutional isomerism is possible in alkanes only if the number of carbon atoms present is

How many hydrogen atoms are present in the molecule 2,5-dimethyloctane

From the response list, select the correct molecular formula for 1,2-dimethylcyclobutane.

From the response list, select the correct molecular formula for cyclohexane.

In which of the following alkanes are 13 covalent bonds present?

Which of the following is a general physical property of alkanes?

What is the common name for the halogenated hydrocarbon whose IUPAC name is 2-chloropropane?

Which of the following alkanes has the IUPAC name 2-methylbutane?

The four hydrogen atoms bonded to the central carbon atom in methane lie at the corners or apexes of a

Which of the following statements concerning organic compounds is correct?

Select from the response list a compound that has two substituents present.

From the response list, select the correct number of constitutional isomers that exist for dichlorocyclopentanes.

Which of the following cycloalkanes or cycloalkane derivatives contains 10 hydrogen atoms?

There are three 5-carbon alkane constitutional isomers. Their molecular formulas are, respectively,

Which of the following compounds is a constitutional isomer of CH3-CH2-CH2-CH2-CH3?

Basic Concepts About Matter

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Which of the following compounds is a constitutional isomer of CH₃-CH₂-CH₂-CH₂-CH₃?