6.4.1 Properties of Alkenes

Cards (34)

  • What is the governing body for chemical nomenclature?
    IUPAC
  • The suffix "-ene" is added to indicate the presence of a double bond
  • The IUPAC name for CH3−CH=CH_{3} - CH =CH−CH2−CH3 CH - CH_{2} - CH_{3} is 2-pentene.
  • What is the suffix for alkanes?
    -ane
  • The physical properties of alkenes are similar to those of alkanes
  • Alkenes have slightly lower boiling points than corresponding alkanes due to weaker intermolecular forces.
  • What introduces a small degree of polarity in alkenes?
    Double bond
  • Alkenes are more reactive than alkanes due to the presence of pi bonds
  • What type of reactions do alkenes primarily undergo?
    Addition
  • Match the addition reaction with its result:
    Hydrogenation ↔️ Saturates the double bond
    Halogenation ↔️ Forms dihaloalkanes
    Hydration ↔️ Forms alcohols
    Hydrohalogenation ↔️ Forms haloalkanes
  • Hydration of alkenes requires an acidic catalyst.
  • In hydrogenation, alkenes react with hydrogen using a nickel or platinum catalyst
  • What product is formed when water is added to an alkene in the presence of an acid catalyst?
    Alcohol
  • Adding halogens to alkenes forms dihaloalkanes
  • Hydration of alkenes in acidic conditions results in the formation of alcohols
  • Hydrohalogenation of alkenes involves adding hydrogen halides to form haloalkanes.
  • Alkenes undergo addition reactions due to the presence of a double bond
  • Hydrogenation of alkenes saturates the double bond to form alkanes.
  • Hydrohalogenation of alkenes involves the addition of a hydrogen halide to form a haloalkane
  • Match the reaction type with its reactant and product:
    Hydrogenation ↔️ H<sub>2</sub> and Alkane
    Halogenation ↔️ X<sub>2</sub> and Dihaloalkane
    Hydration ↔️ H<sub>2</sub>O and Alcohol
    Hydrohalogenation ↔️ HX and Haloalkane
  • Alkenes undergo addition reactions due to the presence of a double bond
  • What catalyst is used in the hydrogenation of alkenes?
    Ni or Pt
  • The hydration of alkenes forms alcohols
  • Match the reaction type with the correct reactant added and product formed:
    1️⃣ Hydrogenation | H<sub>2</sub> | Alkane
    2️⃣ Halogenation | X<sub>2</sub> | Dihaloalkane
    3️⃣ Hydration | H<sub>2</sub>O | Alcohol
    4️⃣ Hydrohalogenation | HX | Haloalkane
  • Alkenes are more reactive than alkanes due to the presence of pi bonds.
  • What does IUPAC stand for?
    International Union of Pure and Applied Chemistry
  • The longest carbon chain containing the double bond forms the root name
  • Steps for naming alkenes according to IUPAC nomenclature:
    1️⃣ Identify the longest carbon chain containing the double bond
    2️⃣ Number the chain so the double bond receives the lowest possible number
    3️⃣ Name substituents and their positions
    4️⃣ Combine substituent information, root name, and double bond position
    5️⃣ Add the suffix "-ene"
  • Alkanes use the suffix "-ane" while alkenes use the suffix "-ene".
  • In what type of solvents are alkenes soluble?
    Nonpolar
  • What type of reactions do alkenes primarily undergo?
    Addition
  • Alkanes undergo substitution reactions, while alkenes undergo addition reactions.
  • In the hydrogenation of alkenes, hydrogen is added to saturate the double bond
  • Match the reaction type with its catalyst or conditions:
    1️⃣ Hydrogenation | Ni/Pt
    2️⃣ Halogenation | None
    3️⃣ Hydration | H<sup>+</sup>
    4️⃣ Hydrohalogenation | None