11.1: Exercises
- Page ID
- 213758
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)Assign one of the structures A – J presented on page 2 to each of the IR spectra provided (1 – 10). Base your assignment on one or more key frequencies, according to guidelines presented in the recitation notes and on p. A19–A31 of your textbook. Especially useful are p. A19 and A20. For each spectrum do the following:
1. Mark key absorption frequencies in the spectrum, and associate each with a specific bond (e.g. O–H, C=O). Keep in mind that there are usually only one or two key bands in each spectrum, although in some cases you might observe up to three. Do not label the alkane C–H stretch, since these bands are present in most organic compounds.
2. Assign a letter from the structures given (A – J). There is only one structure per spectrum.
3. Identify the main functional group present in the structure (i.e. ketone, alcohol, etc.).
4. Provide approximate frequency values for the bands you labeled in the spectrum (in cm–1), and identify their shape (broad, medium, or narrow) and intensity (weak, medium, or strong). Each of the above items is worth 2.5 points, for a total of 10 points per question.
Each of the above items is worth 2.5 points, for a total of 10 points per question.
Key Bands
Bond: O-H | Approximate frequency: 3000 | Shape: broad | Intensity: strong |
Bond: C=O | Approximate frequency: 1700 | Shape: medium | Intensity: strong |
INCOMPLETE OR UNCLEAR ANSWERS WILL RECEIVE NO CREDIT
STRUCTURES
KEY BANDS
Bond: _______ | Approximate frequency: _______ | Shape: ________ | Intensity: ________ |
Bond: _______ | Approximate frequency: _______ | Shape: ________ | Intensity: ________ |
Bond: _______ | Approximate frequency: _______ | Shape: ________ | Intensity: ________ |
GRADE: ___________
KEY BANDS:
Bond: __________ | Approximate frequency: _________ | Shape: _____________ | Intensity: ___________ |
Bond: __________ | Approximate frequency: _________ | Shape: _____________ | Intensity: ___________ |
Bond: __________ | Approximate frequency: _________ | Shape: _____________ | Intensity: ___________ |
GRADE: ___________
KEY BANDS:
Bond: _________ | Approximate frequency: ________ | Shape: _________ | Intensity: _________ |
Bond: _________ | Approximate frequency: ________ | Shape: _________ | Intensity: _________ |
Bond: _________ | Approximate frequency: ________ | Shape: _________ | Intensity: _________ |
GRADE: _______
KEY BANDS:
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
GRADE: _________
KEY BANDS:
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
GRADE: _________
KEY BANDS:
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
GRADE: _________
KEY BANDS:
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
GRADE: _________
KEY BANDS:
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
GRADE: _________
KEY BANDS:
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
GRADE: _________
KEY BANDS:
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
Bond: _________ | Approximate frequency: _______ | Shape: __________ | Intensity: ________ |
GRADE: _________