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Correct order of bond length in two organic molecules

  1. Apr 12, 2017 #1
    1. The problem statement, all variables and given/known data: The correct relation is:
    A. x=y
    B. x>y
    C. x<y
    D. None.
    Please refer to picture attached.

    2. Relevant equations: As stability increases, bond length decreases. When a Π bond is delocalised i.e it takes part in resonance, stability increases.

    3. The attempt at a solution
    I think x takes part in resonance.
    Hence x is more stable than y.
    Thus x<y i.e C is correct option.

    Attached Files:

  2. jcsd
  3. Apr 13, 2017 #2


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    Science Advisor

    Do you know the Hückel rules?
  4. Apr 13, 2017 #3
    yeah, I know..the 4n + 2 Π electron rule...right?
  5. Apr 13, 2017 #4


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    Science Advisor

    Yes, do you see how to apply it here?
  6. Apr 18, 2017 #5
  7. Apr 20, 2017 #6
    more resonance = longer bond
  8. Apr 20, 2017 #7


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    Staff: Mentor

    Compared to what?
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