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Naming Alkenes quiz

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Terms in this set (15)

  • What is the key structural feature that distinguishes alkenes from alkanes?
    Alkenes have at least one carbon-carbon double bond, while alkanes only have single bonds.
  • How is the suffix of the parent hydrocarbon changed when naming an alkene?
    The suffix is changed from '-ane' to '-ene' to indicate the presence of a double bond.
  • When numbering the carbon chain in an alkene, from which end should you start?
    You should start numbering from the end closest to the double bond.
  • What must be specified in the name of an alkene besides the parent chain?
    The location of the double bond and the positions of any substituents must be specified.
  • How are substituents listed when naming alkenes?
    Substituents are listed alphabetically, each with a number indicating its position.
  • What prefixes are used if there are multiple identical substituents on an alkene?
    Numerical prefixes like di-, tri-, tetra-, and penta- are used.
  • What do the terms 'cis' and 'trans' indicate in alkene nomenclature?
    'Cis' means substituents are on the same side of the double bond, while 'trans' means they are on opposite sides.
  • Why is cis-trans isomerism important in alkenes?
    It distinguishes alkenes with the same molecular formula but different spatial arrangements.
  • Is cis-trans notation used for cyclic alkenes?
    No, cis-trans notation is not applicable for cyclic alkenes.
  • What is the first step in naming an alkene?
    The first step is to find the longest carbon chain containing the double bond.
  • If there is a tie for the longest chain in an alkene, which chain should you choose?
    Choose the chain that allows for the greatest number of substituents.
  • How do you name a ring structure with a double bond?
    Start counting from the double bond and name the compound with the prefix 'cyclo-'.
  • When numbering a cyclic alkene, how do you decide the direction to count?
    Count in the direction that reaches the substituent the fastest.
  • What does the presence of a pi bond in alkenes cause?
    The pi bond restricts rotation around the double bond, leading to geometric isomerism.
  • Why is understanding alkene naming conventions important?
    It helps in grasping the structural complexity and reactivity of alkenes in organic chemistry.