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Author Question: Below is the mass spectrum of an unknown hydrocarbon. In addition, this hydrocarbon shows ... (Read 317 times)

kshipps

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on: Aug 23, 2018

Below is the mass spectrum of an unknown hydrocarbon. In addition, this hydrocarbon shows characteristic absorption at 2100 cm1 in its IR spectrum. Give the structure of this unknown.
 
   
 
   (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/)



Question 2

Instructions: Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s).
 
   
 
   (Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/)


  Refer to instructions. Propose structures for fragment ions at m/z = 57, 43, and 29

Question 3

Instructions: Refer to the mass spectrum of 2-methylbutane shown below to answer the following question(s).
 
   



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Ashley I

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Reply #1 on: Aug 23, 2018
Answer to Question 1

The formula weight of 54 corresponds to a molecular formula of C4H6, which has two degrees of unsaturation. Possible structures for this formula are:



The IR data is consistent with an internal alkyne, so the compound is but-2-yne.



Answer to Question 2

m/z
structure
57

43

29


Answer to Question 3

The peak at m/z = 43 is the base peak.

Answer to Question 4

The peak at m/z = 72 represents M+.

Answer to Question 5

This compound has the formula C9H20O and a mass of 144. Dehydration will result in the loss of H2O producing a charged fragment at m/z = 126, 18 mass units less than M+.



Answer to Question 6

This compound, phenylacetone, has the formula C9H10O and a nominal mass of 134. Alpha cleavage will result in charged fragments at m/z = 43 and m/z = 119.



Answer to Question 7

Since the molecular ions are even numbers, loratidine must have an even number of nitrogen atoms. Therefore, the minimum number of nitrogen atoms in loratidine is two.

Answer to Question 8

e


kshipps

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Reply 2 on: Aug 23, 2018
YES! Correct, THANKS for helping me on my review

mcabuhat

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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