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Define Organic Compounds As Polar Or Nonpolar

  1. Oct 4, 2014 #1
    1.Which of the following compounds are nonpolar?

    1) decene

    2) decanal

    3) 3-methyl-2-decene

    4) 1,2-pentanediol

    5) cyclohexanol

    Select one:
    a. 1,2 and 3 only
    b. 1 and 2 only
    c. 3,4 and 5 only
    d. 1,2,3 and 5 only
    e. 1 and 3 only

    2. Which of the following compounds are polar?

    1) 2-butyne

    2) propanal

    3) propanamide

    4) 3-aminopentane

    5) 3-heptene

    Select one:
    a. 2, 3 and 5 only
    b. 1, 3 and 5 only
    c. 3,4 and 5 only
    d. 1,2,4 and 5 only
    e. 2, 3 and 4 only

    3. The attempt at a solution

    1. For this question I'm tossing up between a and d. I'm pretty confident on 1, 2 and 3 because they are hydrocarbons without any functional groups that can donate protons. I know cyclohexanol has a OH functional group which is very polar but the fact that it's not soluble in water is throwing me off. I would probably go with A at the moment.

    2. For this one I'm going with E as 5 is an alkene without any functional groups which means it is nonpolar. This cancels out A-D.

    Thanks for the help!
     
  2. jcsd
  3. Oct 4, 2014 #2

    Borek

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    Staff: Mentor

    You don't need a group donating protons for molecule to be polar. Chloromethane is polar.
     
  4. Oct 4, 2014 #3
    Good to know! I don't think that changes any of my answers though so were they right?
     
  5. Oct 4, 2014 #4

    Borek

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    Staff: Mentor

    It does ;)

    Analyze the first question again.
     
  6. Oct 4, 2014 #5
    Does that mean cyclohexanol isn't polar so the answer would be 1.D and 2.E ? Thanks for all the help by the way!
     
  7. Oct 4, 2014 #6

    Borek

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    Staff: Mentor

    No, cyclohexanol is polar (all alcohols are, just like products of their oxidation).
     
  8. Oct 4, 2014 #7
    Well if A and D are wrong for 1 I assume it's between B and E? In that case I would go with E as aldehydes are a lot more polar than alkenes?
     
  9. Oct 4, 2014 #8

    Borek

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    Staff: Mentor

    E would be my answer.
     
  10. Oct 5, 2014 #9
    Sounds good but I thought that aldehydes were considered to be pretty nonpolar which would mean decanal would be nonpolar as well as its the simplest 10 carbon aldehyde?
     
  11. Oct 5, 2014 #10

    Borek

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    Staff: Mentor

    They are definitely more polar than hydrocarbons. Carbonyl itself is quite polar.
     
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