What would be the m/z ratio of the molecular ion (i.e, the parent ion from electron impact ionization) of 2,2-dimethylpropane? (Fill in an integer number)
m/z ratio of M+● will be 72.
While base peak will be at m/z = 57 , it corresponds to loss of methyl group(-CH3) and formation of very stable 3o carbocation ((CH3)3C+) i.e. t-butylcarbocation.
What would be the m/z ratio of the molecular ion (i.e, the parent ion from electron...
a) Describe the difference between the base peak and the parent
ion (or molecular ion) peak.
b) Identify the base peak and the parent ion (or molecular ion)
peak (if any) according to the mass spectrum.
c) Identify the mass fragments which correspond to m/z = 77,
105, 111, and 139.
d) Identify and give explanations for the magnitude (or
intensity) of the peaks at m/z = 113, 141, and 218.
Mass Spectrum ofp-C hlorobenzophenone 105 100 80 139 CI...
3. The Bohr model can be applied to any hydrogen-like ion (i.e. any ion with only one electron) This requires the following modification to the Rydberg equation, where Z is the atomic number 1 (RH)(Z)2 2 What is the ionization energy (in kJ/mol) of He* in its ground state? You must show all of your work to receive any credit Answer kJ/mol
5) What m/z ratio would expect to find in the mass spectrum of the Sollowing compound due to dehydration? 6) Ethyl acetate and 2-butene-1,4-diol both have the molecular formula C1sO2. How would you use infrared spectroscopy to distinguish between the two? 7) Predict the m/z position of the parent peak, the peak due to dehydration of the alcohol and a-dleavage of the carbonyl in the mass spectrum of the compound shown below.
5) What m/z ratio would expect to find...
4. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z 100 with a base peak at m/z 43, an IR peak at 1720 cm' which gave the following 'H NMR spectrum. 33 N - PPM 5. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z 100 with a base peak at m/z 43, an IR peak at 1720 cm' which gave the following 'H NMR spectrum. doublet 2...
Circle the molecular ion peak for the following MS spectrum and
the m/z value for the molecular ion is _____________
4. Circle the molecular ion peak for the following MS spectrum and the m/z value for the molecular ion is 42 pt) 100 80- 60- ? 40- 20- 10 20 30 40 50 m z
parent ion at m/z 102 (M*), IR peaks at 1740 and 1150 cm 10. Propose a structure for a molecule whose mass spectrum shows which gave the following 'H NMR spectrum.) 6 1 septet 2 5 0 6 PPM 11. Propose a structure for a molecule whose mass spectrum shows a parent ion at m/z 116 (M*) with at 1740 and 1150 cm1 which gave the following H NMR spectrum. base peak at m/z 43, IR peaks 6 1 2...
Propose three reasonable molecular formulas for a molecular ion at m/z=152.
Propose three reasonable molecular formulas for a molecular ion at m/z = 176, (show calculations; 3 pts) Propose two reasonable structures for a hydrocarbon having an exact mass of 122.1096 that forms 1-ethyl-1-methylcyclohexane upon hydrogenation with excess H2 and Pd-C. (2 pts) 3. 4. A low resolution mass spectrum of a neurotransmitter gave a molecular ion at m/z s 153. Three possible formulas for this molecular ion are Coth/N,O2. Cat,NO, and C,HnN,O. A high resolution mass spectrum provided a exact...
If a non-cyclic alkane shows a molecular ion peak at m/z 212, what is the chemical formula?
If a non-cyclic alkane shows a molecular ion peak at m/z 3.80 × 102, what is the chemical formula?