Chapter 15, Problem 45PP

(a)

Interpretation Introduction

Interpretation:

The number of signals that are expected in the ${}^{\text{1}}\text{H}$ NMR spectrum of the given compound has to be given.

Concept introduction:

${}^{\text{1}}\text{H NMR}$: A technique gives information to predict the Carbon and Hydrogen connectivity in the organic compounds.

Homotopic: If the protons are interchangeable through rotational symmetry, then the protons are chemically equivalent and termed as homotopic.

Enantiotopic protons: If subjected protons in the molecule can be interchanged through rotational or reflection symmetry known as Enantiotopic protons and the protons are chemically equivalent.

Diastereotopic: If the protons are not interchangeable through either of the symmetry operations, then the protons are Diastereotopic; the protons are not chemically equivalent if a chiral center present in the molecule.

Replacement test: In the molecule; if replacing each one of the subjected protons with deuterium gives the two compounds are same; then the protons are chemically equivalent.

(b)

Interpretation Introduction

Interpretation:

The number of signals that are expected in the ${}^{\text{1}}\text{H}$ NMR spectrum of the given compound has to be given.

Concept introduction:

${}^{\text{1}}\text{H NMR}$: A technique gives information to predict the Carbon and Hydrogen connectivity in the organic compounds.

Homotopic: If the protons are interchangeable through rotational symmetry, then the protons are chemically equivalent and termed as homotopic.

Enantiotopic protons: If subjected protons in the molecule can be interchanged through rotational or reflection symmetry known as Enantiotopic protons and the protons are chemically equivalent.

Diastereotopic: If the protons are not interchangeable through either of the symmetry operations, then the protons are Diastereotopic; the protons are not chemically equivalent if a chiral center present in the molecule.

Replacement test: In the molecule; if replacing each one of the subjected protons with deuterium gives the two compounds are same; then the protons are chemically equivalent.