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8.6.2: Boiling Points of Some Organic Compounds Whose Molecules Contain 32 or 34 Electrons

  • Page ID
    49741
  • Name Projection Formula Type of Compound Boiling Point in degrees C
    Isobutane "C" "H" 3 group connected to the middle "C" of three carbon straight chain alkane. Branched Alkane -10.2
    n-Butane Straight chain consisting of four "C". Three middle "C" is connected to two "H" each. Left and right "C" are connected to 3 "H" each. Normal Alkane -0.5
    Methyl ethyl ether "C" "H" 3 group bonded to an "O" which is also bonded to a "C" "H" 2 "C" "H" 3 group. Ether 10.8
    Methyl Formate A "C" "H" 3 group is bonded to an "O" which is also bonded to a second "C". This "C" is double bonded to an "O" and single bonded to a "H". Ester 31.5
    Propanal A "C" "H" 3 "C" "H" 2 group is connected to another "C" which is double bonded to an "O" and single bonded to a "H". Aldehyde 48.8
    Acetone Central "C" is double bonded to an "O". Bonded at an angle on its left and right side is two identical "C" "H" 3 groups. Ketone 56.2
    2-Propanol "O" "H" group connected to the middle "C" of three carbon straight chain alkane. Left and right "C" is connected to 3 "H" each. Middle C, in addition to "C" "H" 3 group has one bond with "H". Alcohol 82.4
    1-Propanol A "C" "H" 3 "C" "H" 2 "C" "H" 2 straight alkane chain is bonded to an "O" "H" group via its last "C". Alcohol 82.4
    Acetic Acid A "C" "H" 3 group is bonded to a "C" which is double bonded to an "O" and single bonded to an "O" "H" group. Carboxylic acid 117.9
    Ethylene Glycol 2 "C" in a straight chain with each "C" single bonded to an "O" "H" group and 2 "H". Dialcohol (two OH groups) 198

    This table shows the boiling points of organic compounds of similar size. This, then, provides a good means of comparing intermolecular forces of different structure types. In general, decreasing branching, increasing polarity, and increasing hydrogen bonding opportunities increases the boiling point. This makes sense, as all three of these contribute to increase intermolecular forces.

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