Question 1

Consider the following ball-and-stick model.   Which of the following represents a constitutional isomer of the compound shown above?

Accepted Answer

A)  methylpropane 
B)  CH3CH2CH2CH2CH3 
C)    
D)  none of these 
A)  methylpropane 
B)  CH3CH2CH2CH2CH3 
C)    
D)  none of these C

Question 2

Pentane and 2-methylbutane have a third constitutional isomer called neopentane. What is the IUPAC name of neopentane?

Accepted Answer

A)  2,2-dimethylpropane 
B)  2-methylisobutane 
C)  2-ethylpropane 
D)  none of these 
A)  2,2-dimethylpropane 
B)  2-methylisobutane 
C)  2-ethylpropane 
D)  none of these A

Question 3

What is the IUPAC name of the following compound?

Accepted Answer

A)  cis-1,5-diethylcyclopentane 
B)  trans-1,2-diethylcyclpentane 
C)  cis-1,2-diethylcyclopentane 
D)  trans-1,5-diethylcyclopentane 
A)  cis-1,5-diethylcyclopentane 
B)  trans-1,2-diethylcyclpentane 
C)  cis-1,2-diethylcyclopentane 
D)  trans-1,5-diethylcyclopentane C

Question 4

Decane is an alkane having ten carbon atoms in its carbon chain. What is the total number of hydrogen atoms in decane?

Accepted Answer

A)  12 
B)  24 
C)  22 
D)  18 
A)  12 
B)  24 
C)  22 
D)  18

Question 5

What is the H-C-H bond angle in a methane molecule?

Accepted Answer

A)  104° 
B)  120° 
C)  105.9° 
D)  109.5° 
A)  104° 
B)  120° 
C)  105.9° 
D)  109.5°

Question 6

Which product is obtained when trichloromethane reacts with chlorine gas in the presence of light?

Accepted Answer

A)  Cl2 
B)  CCl4 
C)  CHCl 
D)  CH2Cl 
A)  Cl2 
B)  CCl4 
C)  CHCl 
D)  CH2Cl

Question 7

Which of the following will float on water?

Accepted Answer

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

Question 8

Which of the following straight chain alkanes is a solid at room temperature?

Accepted Answer

A)  C10H22 
B)  C6H14 
C)  C27H56 
D)  none of these 
A)  C10H22 
B)  C6H14 
C)  C27H56 
D)  none of these

Question 9

Which of the following is the molecular formula of hexane?

Accepted Answer

A)  C6H6 
B)  C6H10 
C)  C6H14 
D)  C6H16 
A)  C6H6 
B)  C6H10 
C)  C6H14 
D)  C6H16

Question 10

What is the IUPAC name of the following compound?

Accepted Answer

A)  2-propylcyclohexane 
B)  isopropylcyclohexane 
C)  1-propylhexane 
D)  propylcyclohexane 
A)  2-propylcyclohexane 
B)  isopropylcyclohexane 
C)  1-propylhexane 
D)  propylcyclohexane

Question 11

Hexane and 2-methylpentane are constitutional isomers. Which of the following statements is true of these isomers?

Accepted Answer

A)  Hexane and 2-methylpentane have the same melting point. 
B)  Hexane and 2-methylpentane have the same boiling point. 
C)  Hexane and 2-methylpentane have the same molecular formula. 
D)  Hexane and 2-methylpentane have the same molecular structure. 
A)  Hexane and 2-methylpentane have the same melting point. 
B)  Hexane and 2-methylpentane have the same boiling point. 
C)  Hexane and 2-methylpentane have the same molecular formula. 
D)  Hexane and 2-methylpentane have the same molecular structure.

Question 12

Consider the following ball-and-stick model that shows the top view of a compound.   Which of the following is not a representation of this compound?

Accepted Answer

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

Question 13

Which of the following has the lowest melting point?

Accepted Answer

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

Question 14

Which of the following is the molecular formula of heptane?

Accepted Answer

A)  C5H12 
B)  C6H14 
C)  C7H16 
D)  C8H18 
A)  C5H12 
B)  C6H14 
C)  C7H16 
D)  C8H18

Question 15

Which product is formed when equal moles of methane and chlorine gas react in the presence of light?

Accepted Answer

A)  CH3Cl2 
B)  CHCl3 
C)  CH3Cl 
D)  CHCl 
A)  CH3Cl2 
B)  CHCl3 
C)  CH3Cl 
D)  CHCl

Question 16

How is a sec-butyl group formed?

Accepted Answer

A)  by removing a hydrogen atom from the first carbon of butane 
B)  by removing a hydrogen atom from the second carbon of butane 
C)  by removing a hydrogen atom from the first carbon of 2-methylpropane 
D)  by removing a hydrogen atom from the second carbon of 2-methylpropane 
A)  by removing a hydrogen atom from the first carbon of butane 
B)  by removing a hydrogen atom from the second carbon of butane 
C)  by removing a hydrogen atom from the first carbon of 2-methylpropane 
D)  by removing a hydrogen atom from the second carbon of 2-methylpropane

Question 17

Which by-product is obtained from the reaction of methane with chlorine gas in the presence of light?

Accepted Answer

A)  Cl 
B)  CH2Cl 
C)  HCl 
D)  CHCl 
A)  Cl 
B)  CH2Cl 
C)  HCl 
D)  CHCl

Question 18

What is the IUPAC name of the following compound?

Accepted Answer

A)  1,1-dipropylcyclohexane 
B)  1-isopropyl-1-propylcyclohexane 
C)  isopropylpropylcyclohexane 
D)  1,1-isopropylbutylcyclohexane 
A)  1,1-dipropylcyclohexane 
B)  1-isopropyl-1-propylcyclohexane 
C)  isopropylpropylcyclohexane 
D)  1,1-isopropylbutylcyclohexane

Question 19

A student named a compound 2,2-diethylpentane. Although this name correctly represents the connectivity of the compound, it is not a valid IUPAC name. What is the correct IUPAC name of this compound?

Accepted Answer

A)  3-ethyl-3-methylhexane 
B)  3-methyl-3-propylpentane 
C)  2-ethyl-2-propylbutane 
D)  4,4-diethylpentane 
A)  3-ethyl-3-methylhexane 
B)  3-methyl-3-propylpentane 
C)  2-ethyl-2-propylbutane 
D)  4,4-diethylpentane

Question 20

Which of the following are constitutional isomers? (i) CH3CH2CH2CH2CH2CH2CH2CH3
(ii) 
 
  (iii)

Accepted Answer

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

Exam 11: Alkanes

Consider the following ball-and-stick model. Which of the following represents a constitutional isomer of the compound shown above?

Pentane and 2-methylbutane have a third constitutional isomer called neopentane. What is the IUPAC name of neopentane?

What is the IUPAC name of the following compound?

Decane is an alkane having ten carbon atoms in its carbon chain. What is the total number of hydrogen atoms in decane?

What is the H-C-H bond angle in a methane molecule?

Which product is obtained when trichloromethane reacts with chlorine gas in the presence of light?

Which of the following will float on water?

Which of the following straight chain alkanes is a solid at room temperature?

Which of the following is the molecular formula of hexane?

What is the IUPAC name of the following compound?

Hexane and 2-methylpentane are constitutional isomers. Which of the following statements is true of these isomers?

Consider the following ball-and-stick model that shows the top view of a compound. Which of the following is not a representation of this compound?

Which of the following has the lowest melting point?

Which of the following is the molecular formula of heptane?

Which product is formed when equal moles of methane and chlorine gas react in the presence of light?

How is a sec-butyl group formed?

Which by-product is obtained from the reaction of methane with chlorine gas in the presence of light?

What is the IUPAC name of the following compound?

A student named a compound 2,2-diethylpentane. Although this name correctly represents the connectivity of the compound, it is not a valid IUPAC name. What is the correct IUPAC name of this compound?

Which of the following are constitutional isomers? (i) CH3CH2CH2CH2CH2CH2CH2CH3 (ii) (iii)

Matter, Energy, and Measurement

Atoms

Chemical Bonds

Chemical Reactions

Gases, Liquids, and Solids

Solutions and Colloids

Reaction Rates and Chemical Equilibrium

Acids and Bases

Nuclear Chemistry

Organic Chemistry

Alkenes, Alkynes, and Aromatic Compounds

Alcohols, Ethers, and Thiols

Chirality: the Handedness of Molecules

Amines

Aldehydes and Ketones

Carboxylic Acids

Carboxylic Anhydrides, Esters, and Amides

Carbohydrates

Lipids

Proteins

Enzymes

Chemical Communications: Neurotransmitters and Hormones

Nucleotides, Nucleic Acids, and Heredity

Gene Expression and Protein Synthesis

Bioenergetics: How the Body Converts Food to Energy

Specific Catabolic Pathways: Carbohydrate, Lipid, and Protein Metabolism

Biosynthetic Pathways

Nutrition

Immunochemistry

Body Fluids

Filters

Which of the following are constitutional isomers? (i) CH₃CH₂CH₂CH₂CH₂CH₂CH₂CH₃ _(ii) _(iii)