Give the structure of the charged fragments responsible for the indicated peaks in the mass spectrum of butyrophenone. Hint: The fragment at m/z = 120 forms as a result of a McLafferty rearrangement m/z Structure of charged fragment 148 120 105 77 100 105 80 butyrophenone 60 77 40 20 148 120 25 50 75 100 125 150 m/z Relative Intensity

(6) Describe how mass spectroscopy and IR spectroscopy could be used to distinguish amyl chloride from methyl benzoate; be specific and state the data that would be most useful

3. You are asked to determine the percentage of the components of a mixture containing sodium iodide Nal, magnesium hydroxide, Mg(OH)2, and barium sulfate, BaSO4. The total mass of your mixture sample is 4.82 g. First you extracted the Nal from the mixture with water and filtered insoluble Mg(OH)2 and Baso from the solution, containing the Nal. After evaporating and drying the filtrate, you find that you have recovered 0.95 g of Nal When you react the insoluble residue of Mg(OH)2 and BaSO4 with 3M HCI, the Mg(OH)2 dissolves. After decanting the supernatant liquid containing aqueous MgCl2 from the insoluble BaSO4 and drying the solid, you recover 2.04 g of BasO4 Finally you add 3M KOH solution to the aqueous solution to precipitate the Mg(OH)2. After filtering the solution and drying the precipitate, you recovered 1.21 g of Mg(OH)2. a) Calculate the percent Nal in the original sample mixture b) Calculate the percent Mg(OH)2 in the original sample mixture c) Calculate the percent BaSO,…

Butanal and methylpropanal give slightly different mass spectra. Both give a molecular ion peak at m/z methylpropanal only gives three. State the species responsible for the four other peaks in the mass spectrum of butanal and write equations to show their 72, but butanal gives four other peaks whereas formation from the molecular ion.

The low-resolution mass spectrum of an unknown analgesic X had a molecular ion of 151. Possible molecular formulas include C7H5NO3, C8H9NO2, and C10H17N. Highresolution mass spectrometry gave an exact mass of 151.0640. What is the molecular formula of X?

3. 15.25 In the mass spectrum of the product of the following reaction, the base peak appears at m/z = 57. Explain this outcome. OH conc HCI ?

The mass spectrum of 3-ethyl-3-methylheptane [(CH3CH2)2C(CH3)CH2CH2CH2CH3] shows fragments at m/z = 127, 113, and 85. Propose structures for the ions that give rise to these peaks