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Chemistry LibreTexts

3.E: Organic Compounds: Alkanes and Their Stereochemistry (Exercises)

  • Page ID
    61690
  • These are the homework exercises to accompany the Textmap for McMurry's Organic Chemistry textbook.

    3.1 Functional Groups

    3.1 Exercises

    Questions

    Q3.1.1

    The following is the molecule for ATP, or the molecule responsible for energy in human cells. Identify the functional groups for ATP.

    Solutions

    S3.1.1

    3.2 Alkanes and Alkane Isomers

    3.2 Exercises

    Questions

    Q3.2.1

    Give all the isomers for a straight chain hexanol.

    Solutions

    S3.2.1

    3.3 Alkyl Groups

    3.3 Exercises

    Questions

    Q3.3.1

    Consider the following molecule. How many carbons are in the longest chain? Find a primary and quaternary carbon, and label an ethyl group.

    3-3qu.png

    Solutions

    S3.3.1

    3.3.png

    A = 4° Carbon

    B = Ethyl Group

    C = 1° Carbon

    The longest chain is 10 carbons long

    3.4 Naming Alkanes

    3.4 Exercises

    Questions

    Q3.4.1

    Are the following structures properly named, and if they are not, what is the correct naming?

    Q3.4.2

    Give the name of the following molecules:

    Solutions

    S3.4.1

    They are both labeled incorrectly:

    3-bromo-2-hydroxypentane

    2, 3-dimethylpentane

    S3.4.2

    1 = 3,4-Dimethyl hexane

    2 = 2-methyl pentane

    3 = 2,2,4-trimethyl pentane

    3.6 Conformations of Ethane

    3.6 Exercises

    Questions

    Q3.6.1

    What is the most stable rotational conformation of ethane and explain why it is preferred over the other conformation?

    Solutions

    S3.6.1

    Staggered, as there is less repulsion between the hydrogen atoms.

    3.7 Conformations of Other Alkanes

    3.7 Exercises

    Questions

    Q3.7.1

    Draw the energy diagram for the rotation of the bond highlighted in pentane.

    Solutions

    S3.7.1