Lecture15CHM233(10)final notes

Lecture15CHM233(10)final notes - Which of the following is...

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1 Which of the following is the base peak?
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2 Cyclohexene was treated with an unknown reagent and a product X was formed. MS of X is shown below. Based on this information, identify the structure of unknown reagent a. HCl b. HBr c. H 2 O d. CH 3 OH, H +
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3 The mass spectrum of 3-ethyl-3-methylheptane shows fragments at m/z = 127, 113 and 85. Propose the structures for the ions which give these peaks.
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4 Which structure best fits the MS data shown below?
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5 Bonds absorb in four predictable regions of an IR spectrum . Four Regions of an IR Spectrum
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The greater the change in dipole moment, the more intense the absorption When the bond stretches, the increasing distance between the atoms increases the dipole moment The intensity of an absorption band depends on the number of bonds responsible for the absorption O-H, N-H and C-H Absorption
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7 Carbon-Hydrogen Stretching Bonds with more s character absorb at a higher frequency. sp 3 C-H, just below 3000 cm -1 (to the right) sp 2 C-H, just above 3000 cm -1 (to the left) sp C-H, at 3300 cm -1
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8 Carbon-Carbon Bond Stretching
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Lecture15CHM233(10)final notes - Which of the following is...

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