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Positive and negative in destroyer answer choice

Discussion in 'DAT Discussions' started by vvvv, Jun 5, 2008.

  1. vvvv

    vvvv 2+ Year Member

    May 12, 2007
    in ochem I saw couple questions that have +- in front of the products. what do they mean by that? anybody knows?
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  3. Mstoothlady2012

    Mstoothlady2012 5+ Year Member

    Apr 7, 2007
    for example........?
  4. creative8401

    creative8401 Im Anush Hayastan 2+ Year Member

    Jan 22, 2008
    Hi. I’ve seen that one too. For example, in question 29, we see a +- sign, and from my understanding, this is used to show enantiomers of the product. For example, when we are dealing with BH3, THF, with H2O2 and OH-, the product is syn addition of OH and H. Thus, it can add cis and trans to the product. In a much deeper understanding, it refers to the plane of polarized light. Such things are determined experimentally, but it means that one bends light clockwise and the other counterclockwise.
  5. DDSguyLA

    DDSguyLA 2+ Year Member

    Mar 12, 2008
    well said
  6. TheWiredNerv

    TheWiredNerv 2+ Year Member

    To put it simply, + and - refers to the way light is polarized by the product.
  7. creative8401

    creative8401 Im Anush Hayastan 2+ Year Member

    Jan 22, 2008
    Hi everyone. You have to excuse sometimes my lengthy explanations to some of the questions, but since I don't know how much of an understanding a person has for the concepts, I structure my answers to build from the basics and develop a deeper understanding for the concepts. :)
  8. smile101

    smile101 2+ Year Member

    Dec 4, 2007
    You better know which rxns give enatiomers and and which ones give meso or optically active compounds when reacted. They certainly show up on the test.

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