Fischer Projections and Rotations
18 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What happens to the Fischer convention when a molecule undergoes a 180° rotation?

  • It is broken
  • It becomes ambiguous
  • It remains unchanged (correct)
  • It is only partially maintained
  • What is the effect of rotating a Fischer projection around a single bond?

  • It creates a new compound
  • It breaks the Fischer convention
  • It keeps the stereochemistry unchanged (correct)
  • It changes the stereochemistry
  • How are priorities assigned to substituents on a chiral carbon in a Fischer projection?

  • Randomly
  • Alphabetically
  • By molecular weight
  • By functional group priority (correct)
  • What is required to assign an R or S designation to a stereocenter?

    <p>The priorities of the four substituents</p> Signup and view all the answers

    What is the purpose of the glyceraldehyde enantiomers as stereochemical reference compounds?

    <p>To assign R or S designations</p> Signup and view all the answers

    What happens to the —H and —OH groups after a 90° rotation in a Fischer projection?

    <p>They exchange positions</p> Signup and view all the answers

    What does the -ose suffix designate in a carbohydrate?

    <p>A carbohydrate</p> Signup and view all the answers

    How is a tetrahedral carbon atom represented in a Fischer projection?

    <p>By two crossed lines</p> Signup and view all the answers

    What type of modification can occur to the amino group in a carbohydrate?

    <p>Acetylation</p> Signup and view all the answers

    What is the significance of the root (-tri-, tetr-, pent-, hex-) in a carbohydrate molecular structure?

    <p>It indicates the number of carbon atoms</p> Signup and view all the answers

    How can a Fischer projection be rotated on the page?

    <p>By 180°</p> Signup and view all the answers

    What is the significance of the horizontal and vertical lines in a Fischer projection?

    <p>They represent bonds going into and out of the page</p> Signup and view all the answers

    What is the term for diastereomers differing only at the hemiacetal or acetal carbon in carbohydrate chemistry?

    <p>Anomers</p> Signup and view all the answers

    What is the most stable conformation of pyranose rings?

    <p>Chair conformation</p> Signup and view all the answers

    What is the process by which the pure anomers of D-glucopyranose slowly convert into a 37:63 equilibrium mixture?

    <p>Mutarotation</p> Signup and view all the answers

    What is the purpose of converting ⎯OH groups into esters and ethers in carbohydrate reactions?

    <p>To make the sugars more soluble in organic solvents</p> Signup and view all the answers

    What is the chirality center created by the formation of the cyclic hemiacetal in pyranoses?

    <p>C1</p> Signup and view all the answers

    What is the designation of the OH at the anomeric center that is on the same side of the Fischer projection structure as the hydroxyl that designates whether the structure is D or L?

    <p>α</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Browser