Ochem ch 7 structure and synthesis of alkenes part 2 (pi bond, elements of unsaturation, heteroat

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mikepl103
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243495
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Ochem ch 7 structure and synthesis of alkenes part 2 (pi bond, elements of unsaturation, heteroat
Updated:
2013-10-28 20:24:29
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Ochem structure synthesis alkenes part pi bond elements unsaturation heteroatom alkene cis trans bredt rule E2 vicinal dibromides E1 dehydration alcohols
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Ochem ch 7 structure and synthesis of alkenes part 2 (pi bond, elements of unsaturation, heteroatom, alkene, cis-trans, E-Z, bredt's rule, E2, vicinal dibromides, E1, dehydration of alcohols)
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  1. in terms of cis-trans isomerism, cycloalkenes are assumed to be ____
    cis
  2. ____ cycloalkenes are not stable unless the ring has at least 8 carbons
    trans
  3. Is it possible for cyclooctene molecule to have trans isomerism?
    Yes
  4. Explain E-Z nomenclature
    if high priority groups are on the same side, the name is Z and if high priority groups are on opposite sides, the name is E
  5. why are more substituted alkenes more stable?
    more substituted alkenes are less sterically hindered
  6. Order the following in terms of their stability
    geminal, trans, cis
    cis < geminal < trans
  7. Are small cycloalkenes stable?
    no
  8. why are small cycloalkenes not stable?
    small cycloalkenes have addition ring strain
  9. For cyclodecene and larger cycloalkenes, the ___ double bond is almost as stable as the ___
    trans, cis
  10. What are the physical properties of alkenes
    they have pretty much the same physical properties as alkanes. They have low boiling points (which the boiling points increasing with mass). Branched alkenes have lower boiling points. They are less dense than water. They are also slightly polar (but not solbule inwateR)
  11. Explain how alkenes are slightly polar
    alkene pi bond is polarizable, so instantaneous dipole-dipole interactions occur. Also alkyl groups are electron-donating toward the pi bond, so may have a small dipole moment
  12. what are the four reactions by which alkenes are produced?
    E2 reaction, E1 reaction, Dehalogenation of vicinal dibromides, dehydration of alcohols

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