1. Infrared Spectrum - On the IR spectrum, label all pertinent peak(s) 2·The Ele
ID: 589193 • Letter: 1
Question
1. Infrared Spectrum - On the IR spectrum, label all pertinent peak(s) 2·The Elemental Analysis. Show Calculations for obtaining the Empirical Formula %N Empirical Formula: Calculate the molecular weight based on the empirical formula, using the whole-number values discussed for the mass spectral analysis 3· The Mass spectrum: a List the value for the Molecular Ion 3 b. Halide (if applicable): Br / Cl Peaks used to identify: M. we Meur- : c. Does the molecular ion match the MW of the empirical formula? y/ d. If no, what is the ratio between the molecular ion and the molecular weight of the Molecular Weight: empirical formula? 2 3:1 4:1 5:1
Explanation / Answer
the answer, 4-tertbutyl benzoic acid is correct only, from the mass and proton NMR it is confrmed.
firstly from the mass, the molecular ion peak was formed at m/z 178.
then in proton NMR, There is a nine proton singlet formed which is due to three methyl groups, and a broad singlet formed at 12.5 is due to carboxylic acid OH group., then the two doublets are due to protons present on the benzene ring
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