Organic Chemistry (9th Edition)
Organic Chemistry (9th Edition)
9th Edition
ISBN: 9780321971371
Author: Leroy G. Wade, Jan W. Simek
Publisher: PEARSON
Question
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Chapter 12, Problem 12.15SP

(a)

Interpretation Introduction

To determine: The characteristic infrared absorption frequencies to distinguish between the given pair of compound.

Interpretation: The characteristic infrared absorption frequencies to distinguish between the given pair of compound are to be described.

Concept introduction: An IR spectrum is a graph for the energy absorbed by a molecule as a function of the frequency or wavelength of light. Alkanes, alkenes and alkynes have characteristic CH stretching frequencies. Isolated alkenes have value 16401680cm1 and that of conjugated alkenes have 16201640cm1 frequencies.

The symmetric bonds that have same chemical environment at both the ends are IR inactive and the asymmetric bonds which have different chemical environment are IR active.

(b)

Interpretation Introduction

To determine: The characteristic infrared absorption frequencies to distinguish between the given pair of compound.

Interpretation: The characteristic infrared absorption frequencies to distinguish between the given pair of compound are to be described.

Concept introduction: An IR spectrum is a graph for the energy absorbed by a molecule as a function of the frequency or wavelength of light. Alkanes, alkenes and alkynes have characteristic CH stretching frequencies. Isolated alkenes have value 16401680cm1  and that of conjugated alkenes have 16201640cm1 frequencies.

The symmetric bonds that have same chemical environment at both the ends are IR inactive and the asymmetric bonds which have different chemical environment are IR active.

(c)

Interpretation Introduction

To determine: The characteristic infrared absorption frequencies to distinguish between the given pair of compound.

Interpretation: The characteristic infrared absorption frequencies to distinguish between the given pair of compound are to be described.

Concept introduction: An IR spectrum is a graph for the energy absorbed by a molecule as a function of the frequency or wavelength of light. Alkanes, alkenes and alkynes have characteristic CH stretching frequencies. Isolated alkenes have value 16401680cm1 and that of conjugated alkenes have 16201640cm1 frequencies.

The symmetric bonds that have same chemical environment at both the ends are IR inactive and the asymmetric bonds which have different chemical environment are IR active.

(d)

Interpretation Introduction

To determine: The characteristic infrared absorption frequencies to distinguish between the given pair of compound.

Interpretation: The characteristic infrared absorption frequencies to distinguish between the given pair of compound are to be described.

Concept introduction: An IR spectrum is a graph for the energy absorbed by a molecule as a function of the frequency or wavelength of light. Alkanes, alkenes and alkynes have characteristic CH stretching frequencies. Isolated alkenes have value 16401680cm1  and that of conjugated alkenes have 16201640cm1 frequencies.

The symmetric bonds that have same chemical environment at both the ends are IR inactive and the asymmetric bonds which have different chemical environment are IR active.

(e)

Interpretation Introduction

To determine: The characteristic infrared absorption frequencies to distinguish between the given pair of compound.

Interpretation: The characteristic infrared absorption frequencies to distinguish between the given pair of compound are to be described.

Concept introduction: An IR spectrum is a graph for the energy absorbed by a molecule as a function of the frequency or wavelength of light. Alkanes, alkenes and alkynes have characteristic CH stretching frequencies. Isolated alkenes have value 16401680cm1 and that of conjugated alkenes have 16201640cm1 frequencies.

The symmetric bonds that have same chemical environment at both the ends are IR inactive and the asymmetric bonds which have different chemical environment are IR active.

(f)

Interpretation Introduction

To determine: The characteristic infrared absorption frequencies to distinguish between the given pair of compound.

Interpretation: The characteristic infrared absorption frequencies to distinguish between the given pair of compound are to be described.

Concept introduction: An IR spectrum is a graph for the energy absorbed by a molecule as a function of the frequency or wavelength of light. Alkanes, alkenes and alkynes have characteristic CH stretching frequencies. Isolated alkenes have value 16401680cm1  and that of conjugated alkenes have 16201640cm1 frequencies.

The symmetric bonds that have same chemical environment at both the ends are IR inactive and the asymmetric bonds which have different chemical environment are IR active.

(g)

Interpretation Introduction

To determine: The characteristic infrared absorption frequencies to distinguish between the given pair of compound.

Interpretation: The characteristic infrared absorption frequencies to distinguish between the given pair of compound are to be described.

Concept introduction: An IR spectrum is a graph for the energy absorbed by a molecule as a function of the frequency or wavelength of light. Alkanes, alkenes and alkynes have characteristic CH stretching frequencies. Isolated alkenes have value 16401680cm1  and that of conjugated alkenes have 16201640cm1 frequencies.

The symmetric bonds that have same chemical environment at both the ends are IR inactive and the asymmetric bonds which have different chemical environment are IR active.

(h)

Interpretation Introduction

To determine: The characteristic infrared absorption frequencies to distinguish between the given pair of compound.

Interpretation: The characteristic infrared absorption frequencies to distinguish between the given pair of compound are to be described.

Concept introduction: An IR spectrum is a graph for the energy absorbed by a molecule as a function of the frequency or wavelength of light. Alkanes, alkenes and alkynes have characteristic CH stretching frequencies. Isolated alkenes have value 16401680cm1  and that of conjugated alkenes have 16201640cm1 frequencies.

The symmetric bonds that have same chemical environment at both the ends are IR inactive and the asymmetric bonds which have different chemical environment are IR active.

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The reaction for obtaining NO2 from NO and O2 has the rate equation: v = k[NO]2[O2]. Indicate which of the following options is correct.(A). This rate equation is inconsistent with the reaction consisting of a single trimolecular step.(B). Since the overall order is 3, the reaction must necessarily have some trimolecular step in its mechanism.(C). A two-step mechanism:  1) NO + NO ⇄ N2O2 (fast);   2) N2O2 + O2 → NO2 + NO2 (slow).(D). The mechanism must necessarily consist of three unimolecular elementary steps with very similar rate constants.
a. What is the eluent used in the column chromatography here (a “silica plug filtration” is essentially a very short column)? b. The spectroscopy of compound 5b is described in the second half of this excerpt, including 1H-NMR and 13C-NMR (which you will learn about in CHEM 2412L), MS (which you will learn about later in CHEM 2411L) and IR. One of the IR signals is at 3530 cm-1. What functional group does this indicate might be present in compound 5b?
Steps and explanations. Also provide, if possible, ways to adress this kind of problems in general.
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