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priority order of chiral compound

Discussion in 'MCAT Study Question Q&A' started by MikeMitchell, Jul 26, 2011.

  1. MikeMitchell

    May 26, 2011
    Likes Received:
    A chiral carbon has substituents of h3c, oh, br, and cho (attached at c). What priority is cho?

    This is an examkrackers question with answer of 2. Shouldn't it be priority three? I strongly distrust this 1001 questions book. Lots of typos.

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  3. MShopes

    5+ Year Member

    Jun 16, 2011
    Likes Received:
    Pharmacy Student
    You are right! It should be third in priority. The trend goes like that from the first to last: Br>OH>CHO>H3C.

    The CHO can't be 2nd priority because OH starts with O which is better than C in CHO. And of course Br is superior to all of them because it has the highest atomic number.

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