The systematic name of isoprene and the structures of the given polymers with configuration about the carbon-carbon double are to be drawn. Concept introduction: Polymers are very large molecules having high molecular masses, hence are also called as macromolecules. The structure of polymers consists of a very large number of repeating units joined together through covalent bonds in a regular fashion. Isoprene is the repeating unit in natural rubber.

Question

Part II. Given two isomers: 2-methylpentane (A) and 2,2-dimethyl butane (B) answer the following: (a) match structures of isomers given their mass spectra below (spectra A and spectra B) (b) Draw the fragments given the following prominent peaks from each spectrum: Spectra A m/2 =43 and 1/2-57 spectra B m/2 = 43 (c) why is 1/2=57 peak in spectrum A more intense compared to the same peak in spectrum B. Relative abundance Relative abundance 100 A 50 29 29 0 10 -0 -0 100 B 50 720 30 41 43 57 71 4-0 40 50 60 70 m/z 43 57 8-0 m/z = 86 M 90 100 71 m/z = 86 M -O 0 10 20 30 40 50 60 70 80 -88 m/z 90 100

Answer 1

Question

Chapter 22, Problem 80E

(a)

Interpretation Introduction

Interpretation: The systematic name of isoprene and the structures of the given polymers with configuration about the carbon-carbon double are to be drawn.

Concept introduction: Polymers are very large molecules having high molecular masses, hence are also called as macromolecules. The structure of polymers consists of a very large number of repeating units joined together through covalent bonds in a regular fashion. Isoprene is the repeating unit in natural rubber.

(b)

Interpretation Introduction

Interpretation: The systematic name of isoprene and the structures of the given polymers with configuration about the carbon-carbon double are to be drawn.

Concept introduction: Polymers are very large molecules having high molecular masses, hence are also called as macromolecules. The structure of polymers consists of a very large number of repeating units joined together through covalent bonds in a regular fashion. Isoprene is the repeating unit in natural rubber.

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Part II. Given two isomers: 2-methylpentane (A) and 2,2-dimethyl butane (B) answer the following: (a) match structures of isomers given their mass spectra below (spectra A and spectra B) (b) Draw the fragments given the following prominent peaks from each spectrum: Spectra A m/2 =43 and 1/2-57 spectra B m/2 = 43 (c) why is 1/2=57 peak in spectrum A more intense compared to the same peak in spectrum B. Relative abundance Relative abundance 100 A 50 29 29 0 10 -0 -0 100 B 50 720 30 41 43 57 71 4-0 40 50 60 70 m/z 43 57 8-0 m/z = 86 M 90 100 71 m/z = 86 M -O 0 10 20 30 40 50 60 70 80 -88 m/z 90 100

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