An organic compound contains 66.6% carbon, 11.1% hydrogen 22.3% oxygen (m/z = 72). In UV, it gave a characteristic band at 275 mu, ɛmax 17. In IR, bands are formed at 2941-2857 (m) 1715 (s), and 1460 cm³¹ (m). In NMR, three signals appear -1 13, at ♂ (ppm) = 2.48 (quartet, 2H), 2.12 (singlet, 3H), and 1.07 (triplet, 3H) and in ¹³℃ four signals are 212, 39, 17, 9. Determine the structural formula of the compound.

An organic compound contains 66.6% carbon, 11.1% hydrogen 22.3% oxygen (m/z = 72). In UV, it gave a characteristic band at 275 mu, ɛmax 17. In IR, bands are formed at 2941-2857 (m) 1715 (s), and 1460 cm³¹ (m). In NMR, three signals appear -1 13, at ♂ (ppm) = 2.48 (quartet, 2H), 2.12 (singlet, 3H), and 1.07 (triplet, 3H) and in ¹³℃ four signals are 212, 39, 17, 9. Determine the structural formula of the compound.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter33: High-performance Liquid Chromatography

Section: Chapter Questions

Problem 33.14QAP

See similar textbooks

Similar questions

The molecule with strong absorptions at 1800 and 1760 cm ^ -1 is:
Potassium dichromate (K2Cr2O7) and potassium permanganate (KMnO4) give overlapping UV-Vis absorption spectra in 1 M sulphuric acid. K2Cr2O7 shows an absorption maximum at 440 nm and KMnO4 shows the absorption maximum at 545 nm . An unknown sample solution containing a mixture of K2Cr2O7 and KMnO4 was analyzed using a 1-cm cell and the absorbance values at these two wavelengths were as follows: A440 = 0.515 and A545 = 0.835 The absorbance values for standard solutions of K2Cr2O7 (1.00 x 10-3 M) and KMnO4 (2.00 x 10-4 M) in 1 M sulphuric acid using the same 1 cm cell were as follows: Calculate the concentrations of K2Cr2O7 and KMnO4 in the unknown sample.
For 1,6-diphenyl-1,3,5-hexatriene, the transition is observed at approximately =358 nm corresponding to n i = 3 → n f = 4 What is the apparent length of the π-network?
When a sample of 4-heptanone was irradiated for 100 sec with 313 nm radiation with a power output of 50 W under conditions of total absorption, it was found that 2.8 mmole C2H4 was formed. What is the quantum yield for the formation of ethane?
The most intense absorption band in the visible spectrum of [Mn(H2O)6]2+ is at 24,900 cm-1 and has a molar absorptivity of 0.038 L mol-1 cm-1. What concentration of [Mn(H2O)6]2+ would be necessary to give an absorbance of 0.10 in a cell of path length 1.00 cm?
Using The Tanabe-Sugano Diagram, Estimate Δ And B For (A) [Ni(OH2)6]2+ Absorptions At 8500, 15,400, And 26,000 Cm-1)
The following data have been obtained in the calibration of a series of standards for the determination of iron, measuring the transmittance, at 506 nm and thickness of 1.00 cm of iron (II) solutions in which color with 1.10 has been developed -phenanthroline. [Fe] (ppm) 0.20 0.40 0.60 0.80 1.00 2.00 3.00 4.00 5.00 6.00 7.00 T (%) 90.0 82.5 76.0 69.5 63.5 41.0 26.3 17.0 10.9 7.0 4.5 Calculate the mean molar absorptivity of iron when determined by this method.
Absorption bands in the region of 1600-1700 cm-1 are often used for quantification of caffeine. What does the bands in this region refer to?
Thienothiophene and sexithiophene are conjugated molecules used in printed organic electronics. A chlorobenzene solution of equal concentrations of the two molecules was prepared and its absorbance was recorded with a 0.01 cm sample cell to give 0.88 % transmittance (T) at 400 nm. Calculate the concentration of each of the molecules given that the molar absorption coefficient of the thienothiophene is 23,000 L.mol-1cm-1 and the sexithiophene is 34,000 L.mol-1cm-1. Remember that absorbance is additive.
a.) The spacings of the rotational fine structure lines of carbon dioxide 12C16O2 are determined from IR spectroscopy to be 0.7604 cm-1. Calculate the C=O bond length of the molecule (given masses: m(12C) = 12 amu, m(16O) = 15.9949 amu).Ans = ______ Angstroms b.) Suppose that the wavenumber of the J = 1 ← 0 rotational transition of 1H79Br considered as a rigid rotor was measured to be 17.89 cm-1, what is the bond length? Ans = ____ Angstroms When the moment of interia is 3.132x10^-47 kg*m^2(Given the isotopic masses:(m(79Br) = 78.9183 amu, m(81Br) = 80.9163 amu)
Two species A and B are known to have water/hexane partition coefficient of 5.99 and 6.16. They are separated by elution on silica gel with hexane as eluent. The ratio for the packing VS/VM =0.425 Two species A and B are known to have water/hexane partition coefficient of 5.99 and 6.16. They are separated by elution on silica gel with hexane as eluent. The ratio for the packing VS/VM =0.425a. Calculate the retention factor for each soluteb. Calculate the selectivity factorc. How many plates are needed to provide a resolution of 1.5?d. What column length should be used to provide a resolution of 1.5 if the plate height ofthe packing is 1.5 ×10-3 cm?e. If the flow rate is 6.75 cm min-1, how long will it take to elute the two species?
Inductively coupled plasma–optical emission spectrometry (ICP-OES) was used for the determination of cadmium using indium as an internal standard. A solution containing 2.15 ppm Cd2+ and 5.76 ppm In3+ gave signals of 19,291 and 37,190 counts for cadmium and indium, respectively. A 0.01652 g sample was dissolved in acid and quantitatively transferred to a 250.0 mL volumetric flask. A 1.00 mL aliquot of 264.5 ppm In3+ was added and the flask was diluted to volume with deionized water. ICP-OES analysis of the sample solution gave signals of 31,109 and 118,941 counts for cadmium and indium, respectively. What was concentration of the Cd2+ in the sample? Give answer all questions with explanation