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(a)
Interpretation:
The structure and mechanism of formation of fragments of
Concept introduction:
In mass spectroscopy, compounds can be identified on the basis of mass of compound. When the compound breaks into fragment then they can be distinguished from the other compounds. This technique is also used to differentiate the isotopes of compounds. This technique did not interact with
(b)
Interpretation:
The structure and mechanism of formation of fragment of
In mass spectroscopy, compounds can be identified on the basis of mass of compound. When the compound breaks into fragment then they can be distinguished from the other compounds. This technique is also used to differentiate the isotopes of compounds. This technique did not interact with electromagnetic radiation. Two peaks are used to identify the compound, first, the molecular ion peak which is the mass of the compound and second, the base peak which is the most abundant element peak. It may be same or different.
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Chapter 12 Solutions
EBK ORGANIC CHEMISTRY
- What is the fragment for the base peak at m/z = 29? Deduce and explain the halogen present in the compound. Hence, identify compound B. Suggest why the two peaks at m/z =108 and 110 have almost the same intensity? (Relative atomic masses: F = 19.0, Cl = 35.5, Br = 79.9, I = 126.9)arrow_forwardAccount for the presence of the following peak in the mass spectrum of hexanoic acid, CH3(CH2)4COOH. Q.) m/z 60arrow_forward5. The mass spectrum of an unknown compound shows a molecular ion peak at m/z 119, with a relative intensity of 39. The M + 1 peak has a relative intensity of 1 and the M + 2 peak has a relative intensity of 38. A major IR stretch for the compound is observed at 2253 cm³¹. Additionally, the following ratio of elements was observed following elemental analysis: 20.03% C, 1.68% H, and 11.68% N. Provide a reasonable molecular formula and a structure for the unknown.arrow_forward
- A solution was prepared using 0.0010 g of an unknown steroid (of molecular weight around 255) in 100 mL of ethanol.Some of this solution was placed in a 1-cm cell, and the UV spectrum was measured. This solution was found to havelmax = 235 nm, with A = 0.74.(a) Compute the value of the molar absorptivity at 235 nm.(b) Which of the following compounds might give this spectrum?arrow_forwardThe molecular ion region of the spectrum of biphenyl. M1 is observed at m/z 154 and the intensity of M 1 1 is 12.9% of M1. What formulas of the type CnHxOyNz are consistent with the spectrum?arrow_forwardThe mass spectrum of 2,2-dimethylpropane shows only a very weak molecular ion peak at m/z = 72. However, a large peak at m/z = 57 is seen. Suggest a possible structure of the fragment giving rise to this large peak and suggest a reason as to why this peak is so large.arrow_forward
- Account for the presence of the following peak in the mass spectrum of hexanoic acid, CH3(CH2)4COOH. Q.) A series of peaks differing by 14 amu at m/z 45, 59, 73, and 87arrow_forward3. Dibromocholestanol was analyzed by mass spectrometry using the electron impact (El) ionization technique. The following peaks were observed with relative intensities of ~1:2:1 Low Resolution MS (EI) m/z= 544, 546, and 548 Identify the peaks in the molecular ion pattern and which combination of isotopes produces these peaks: [M]: m/z = formula: [M+2]+: m/z = [M+4]+ : m/z = formula: formula:arrow_forwardAnalysis of a sweet-smelling, neutral compound of carbon, hydrogen and oxygen produced the following results: %C = 54.5; %H = 9.1. From its mass spectrum, the molecular ion had a mass/charge ratio of 88. Its infra-red spectrum showed a prominent peak at 1735 cm–1. Figure below shows the NMR spectrum of the compound. Suggest a structural Formula for this compound.arrow_forward
- In the mass spectrum of an unknown organic compound, the molecular ion had a relative abundance of 20.9 while the M+1 had a relative abundance of 1.2. Estimate the number of carbons in the molecule.arrow_forward30. (6) Determine four molecular formulas for a compound with a mass spectrum of 180: 182 (M: M+2) in a 3:1 ratio. (b) Calculate DBEs for each formula.arrow_forwardA compound used as a moth repellant has three molecular ion peaks at m/z = 146 (100%), 148 (65%) & 150 (10%) amu in its mass spectrum. A pair of smaller peaks are seen at m/z= 111 (34%) & 113 (11%). The infrared spectrum shows sharp absorption just above 3000 cm^-1 region, and also at 1480 cm^-1. The ^1 H nmr shows a single sharp signal at delta = 7.2 ppm, and the ^13 C nmr has two signals (delta = 133 & 130 ppm).arrow_forward
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