Alkenes and unsaturated hydrocarbons

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  1. Alkenes: introduction.
  2. Definitions, properties and uses of alkenes.
  3. Reactions and testing of alkenes
  4. Naming alkenes.
  5. Geometric (E-Z) isomers of alkenes.
  6. Alkynes: definition and properties.
  1. Recall the general formula of alkenes.
    Study the following chemical formulae and identify which fit the general formulae of an alkene.
    1. C10_{10} H22_{22}
    2. C6_6 H6_6
    3. C5_5 H10_{10}
    4. C7_7 H14_{14}
    5. C2_2 H2_2
  2. Recall the test to distinguish alkenes and alkanes.
    A student has solutions of two simple hydrocarbons, chemical A and B, and adds them separately to two identical test tubes containing a solution of bromine water.
    The student observed no change in the test tube with chemical A and bromine water.
    In the test tube with chemical B and bromine water, there was a noticeable change in the solution.
    1. What was observed when chemical B was mixed with bromine water?
    2. Explain why this change was seen with chemical B and not with chemical A.
    3. Chemical B is a simple hydrocarbon with three carbon atoms in a straight chain. Suggest the name of chemical B.
  3. Apply organic nomenclature to draw structural formula of alkenes.
    Draw the structural or skeletal formula for the following compounds using their IUPAC systematic names.
    1. 2-methylbut-2-ene
    2. 3-ethylhex-3-ene
    3. 4-methylpent-2-ene
    4. Methylpropene
  4. Interpret IUPAC systematic names of chemicals by applying organic nomenclature.
    Study the following compound names. Identify the mistake in each one, and correct it to give the correct IUPAC systematic name.
    1. 3-methylbut-2-ene.
    2. 2-ethylhex-4-ene.
    3. 2-methylprop-2-ene.