Organic Chemistry C H E 111 Lecture 7: Alkenes and Geometric Isomerism
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Questions and Answers

In which of the following cases can geometric isomerism be observed in alkenes according to the given text?

  • When each carbon of the C=C double bond is attached to two identical atoms or groups
  • When there is free rotation around the single bond
  • When each carbon of the C=C double bond is attached to two different atoms or groups (correct)
  • When the atoms are arranged to give different functional groups

    • Which of the following conditions must be met for a molecule to exhibit geometric isomerism?

  • There should be no rotation around the double bond
  • The position of the same functional group is different
  • The atoms are arranged to give different functional groups
  • Each carbon of the C=C double bond should be attached to two different atoms or groups (correct)

    • Why does 1-butene not have geometric isomerism?

  • Because there is free rotation around the single bond
  • Because one carbon of the C=C double bond is attached to two identical groups (correct)
  • Because the atoms are arranged to give different functional groups
  • Because there is no rotation around the double bond

    • Which naming system is used to assign the geometric configuration of alkenes with three or four substituents other than hydrogen?

    <p>E-Z system</p> Signup and view all the answers

    In the E-Z system, how are substituents on each of the double-bond carbons ranked?

    <p>(Lower) (Lower) (CH3 &gt; H) (Cl &gt; CH3) (Higher) (Higher)</p> Signup and view all the answers

    In IUPAC nomenclature of alkenes, how should the parent name be determined?

    <p>By selecting the longest chain that contains the double bond and changing the ending of the name of the alkane of identical length from –ane to -ene</p> Signup and view all the answers

    How should substituted cycloalkenes be numbered in IUPAC nomenclature?

    <p>Number in a way that gives the carbon atoms of the double bond the 1 and 2 positions, and gives substituent groups lower numbers at the first point of difference</p> Signup and view all the answers

    What is the general formula for alkenes (Olefins)?

    <p>$C_nH_{2n}$</p> Signup and view all the answers

    How are substituent groups indicated in the IUPAC nomenclature of alkenes?

    <p>By using the number of the carbon atoms to which they are attached</p> Signup and view all the answers

    How should alkenes be numbered to include both carbon atoms of the double bond?

    <p>Begin numbering at the end of the chain nearer to the double bond</p> Signup and view all the answers

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