Physical Chemistry
2nd Edition
ISBN: 9781133958437
Author: Ball, David W. (david Warren), BAER, Tomas
Publisher: Wadsworth Cengage Learning,
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Chapter 16, Problem 16.46E
(a) The structure of
How many distinct
How many distinct
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The organic compound 1,4-dimethylbenzene (also known as p-xylene) has the formula (CH3)2C6H4. Its structure has two CH3 (methyl) groups substituted at opposite positions on the benzene (C6H6) ring. Predict the number of peaks in the low-resolution proton NMR spectrum of this compound and the relative areas of the peaks.
HO
4.
(a) How many different signals would you expect in the 1HNMR of this product?
(b) How many different signals would you expect in the 13 CNMR of this product?
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Chapter 16 Solutions
Physical Chemistry
Ch. 16 - Prob. 16.1ECh. 16 - Prob. 16.2ECh. 16 - Prob. 16.3ECh. 16 - Prob. 16.4ECh. 16 - Prob. 16.5ECh. 16 - Prob. 16.6ECh. 16 - Prob. 16.7ECh. 16 - Prob. 16.8ECh. 16 - Prob. 16.9ECh. 16 - Prob. 16.10E
Ch. 16 - Prob. 16.11ECh. 16 - Prob. 16.12ECh. 16 - Prob. 16.13ECh. 16 - Prob. 16.14ECh. 16 - Prob. 16.15ECh. 16 - Prob. 16.16ECh. 16 - Prob. 16.17ECh. 16 - Prob. 16.18ECh. 16 - Prob. 16.19ECh. 16 - Prob. 16.20ECh. 16 - Prob. 16.21ECh. 16 - Prob. 16.22ECh. 16 - Prob. 16.23ECh. 16 - Prob. 16.24ECh. 16 - Prob. 16.25ECh. 16 - Prob. 16.26ECh. 16 - Prob. 16.27ECh. 16 - Prob. 16.28ECh. 16 - Prob. 16.29ECh. 16 - Prob. 16.30ECh. 16 - Prob. 16.31ECh. 16 - Prob. 16.32ECh. 16 - Prob. 16.33ECh. 16 - Prob. 16.34ECh. 16 - Prob. 16.35ECh. 16 - Prob. 16.36ECh. 16 - Prob. 16.37ECh. 16 - Prob. 16.38ECh. 16 - Prob. 16.39ECh. 16 - Prob. 16.40ECh. 16 - Prob. 16.41ECh. 16 - Prob. 16.42ECh. 16 - Prob. 16.43ECh. 16 - Prob. 16.44ECh. 16 - Prob. 16.45ECh. 16 - a The structure of 2 chloroethanol is usually...Ch. 16 - Prob. 16.47ECh. 16 - Prob. 16.48ECh. 16 - Prob. 16.49ECh. 16 - Prob. 16.50ECh. 16 - Prob. 16.51ECh. 16 - Prob. 16.52ECh. 16 - Prob. 16.53ECh. 16 - Prob. 16.54ECh. 16 - Prob. 16.55ECh. 16 - Prob. 16.56ECh. 16 - A microwave oven emits radiation having a...
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- The following 1H NMR peaks were recorded on a spectrometer operating at 200 MHz. Convert each into δ units. (a) CHCl3; 1454 Hz (b) CH3Cl; 610 Hz (c) CH3OH; 693 Hz (d) CH2Cl2; 1060 Hzarrow_forwardFor the following compound how many different signals would you see in the carbon NMR? (Assume that you can see them all.) 4 O 5 O 3 09 CO |arrow_forwardThe following molecule will give two signals in the proton (¹H) NMR. H₂C What is the ratio of the signal intensities for the two peaks? 2:2 O 3:1 3:2 CH₂ O 2:1arrow_forward
- The 13C NMR spectrum of ethanoic acid (acetic acid) shows a quartet centred at δ = 21 with a splitting of 130 Hz. When the same spectrum is recorded using proton decoupling, the multiplet collapses to a single line. Another quartet, but with a much smaller spacing, is also seen centred at δ =178; this quartet collapses when decoupling is used. Explain these observations.arrow_forward(a) What would be the chemical shift of a peak that is observed at 655.2 Hz from the reference tetramethylsilane (TMS) recorded using a 90 MHz spectrometer ? (b) At what frequency would the chemical shift of chloroform (CHCl3, δ = 7.28 ppm) occur relative to TMS on a spectrum recorded on a 300 MHz spectrometer? (c) At what frequency and chemical shift would the signal for chloroform occur when using a 1 GHz NMR spectrometer?arrow_forwardFill in the Blanks Type your answers in all of the blanks and submit X₂ X² Ω· Determine the number of signals in the ¹H-NMR spectrum of the given compound as well as the ratio of its integrated signals. Number of signals: 7 Integration: 1 You are incorrect You are incorrect X X (express as the lowest whole number ratio from smallest to largest, e.g.,arrow_forward
- Organic Chemistry - How many signals would you expect in the 1H NMR spectrum of HOCH2CH2CH2CH2OH?arrow_forwardA student needs to prepare a ¹H NMR sample for an organic compound soluble in chloroform (CHCI3). The student cannot use CHCI 3 as the solvent for the sample, but rather uses deuterated chloroform (CDC13) because: O CDC13 is more polar. O CDC13 will not produce a signal in the ¹H NMR spectrum, and therefore will not mask the signals of the compound. O The compound will be more soluble in CDCI 3. O CDC13 is cheaper than CHCI 3.arrow_forwardSketch the form of an A3M2X4 spectrum, where A, M, and X are protons with distinctly different chemical shifts and JAM > JAX > JMX ·arrow_forward
- Propanone (acetone, (CH3)2CO) has a strong absorption at 189 nm and a weaker absorption at 280 nm. Identify the chromophore and assign the absorptions to π* ← n or π* ← π transitions.arrow_forwardhow many peaks wouldyou expect to see in the 13CNMR spectrum of this substance ?arrow_forward(Figure 1) Figure (a) (c) (CH3)3C H (b) (d) 1 of 1 Part A Predict the number of 13C NMR signals in the proton-decoupled spectrum of (a). Express your answer numerically using one significant figure. 15| ΑΣΦ Part B ? Predict the number of 13C NMR signals in the proton-decoupled spectrum of (b). Express your answer numerically using one significant figure. ΠΫΠΙ ΑΣΦ ?arrow_forward
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