The unusual properties of Water and how hydrogen bonding does explain these unusual properties has to be explained. Concept introduction: Intermolecular forces are termed as the forces acting “between molecules” that is components of a substance. Intramolecular forces are the forces that operate “within a molecule”. The prefix “inter” mean “among” and “intra” mean “within”. Arrangement of major types of intermolecular forces in increasing order of strength: London dispersion forces < Dipole-dipole forces < Hydrogen bonding Hydrogen bonding : Hydrogen bonding is weak attractive force that occurs between hydrogen atom bounded to high electronegative atom such as Nitrogen, Oxygen or Fluorine and another adjacent atom having a lone pair of electrons. Hydrogen bonding in water molecule : Hydrogen bond involves a hydrogen atom of one water molecule bounded to a lone pair of electrons on Oxygen atom of another molecule of water. Figure.1

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2. Predict the NMR spectra for each of these two compounds by listing, in the NMR tables below, the chemical shift, the splitting, and the number of hydrogens associated with each predicted peak. Sort the peaks from largest chemical shift to lowest. **Not all slots must be filled** Peak Chemical Shift (d) 5.7 1 Multiplicity multiplate .......... 5.04 double of doublet 2 4.98 double of doublet 3 4.05 doublet of quartet 4 5 LO 3.80 quartet 1.3 doublet 6 Peak Chemical Shift (d) Multiplicity

Answer 1

Question

Chapter 11, Problem 11.131QP

Interpretation Introduction

Interpretation:

The unusual properties of Water and how hydrogen bonding does explain these unusual properties has to be explained.

Concept introduction:

Intermolecular forces are termed as the forces acting “between molecules” that is components of a substance. Intramolecular forces are the forces that operate “within a molecule”. The prefix “inter” mean “among” and “intra” mean “within”.

Arrangement of major types of intermolecular forces in increasing order of strength:

London dispersion forces < Dipole-dipole forces < Hydrogen bonding

Hydrogen bonding: Hydrogen bonding is weak attractive force that occurs between hydrogen atom bounded to high electronegative atom such as Nitrogen, Oxygen or Fluorine and another adjacent atom having a lone pair of electrons.

Hydrogen bonding in water molecule: Hydrogen bond involves a hydrogen atom of one water molecule bounded to a lone pair of electrons on Oxygen atom of another molecule of water.

Figure.1

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2. Predict the NMR spectra for each of these two compounds by listing, in the NMR tables below, the chemical shift, the splitting, and the number of hydrogens associated with each predicted peak. Sort the peaks from largest chemical shift to lowest. **Not all slots must be filled** Peak Chemical Shift (d) 5.7 1 Multiplicity multiplate .......... 5.04 double of doublet 2 4.98 double of doublet 3 4.05 doublet of quartet 4 5 LO 3.80 quartet 1.3 doublet 6 Peak Chemical Shift (d) Multiplicity

Interpreting NMR spectra is a skill that often requires some amount of practice, which, in turn, necessitates access to a collection of NMR spectra. Beyond Labz Organic Synthesis and Organic Qualitative Analysis have spectral libraries containing over 700 1H NMR spectra. In this assignment, you will take advantage of this by first predicting the NMR spectra for two closely related compounds and then checking your predictions by looking up the actual spectra in the spectra library. After completing this assignment, you may wish to select other compounds for additional practice. 1. Write the IUPAC names for the following two structures: Question 2 Question 3 2. Predict the NMR spectra for each of these two compounds by listing, in the NMR tables below, the chemical shift, the splitting, and the number of hydrogens associated with each predicted peak. Sort the peaks from largest chemical shift to lowest. **Not all slots must be filled**

11:14 ... worksheets.beyondlabz.com 3. To check your predictions, click this link for Interpreting NMR Spectra 1. You will see a list of all the - compounds in the spectra library in alphabetical order by IUPAC name. Hovering over a name in the list will show the structure on the chalkboard. The four buttons on the top of the Spectra tab in the tray are used to select the different spectroscopic techniques for the selected compound. Make sure the NMR button has been selected. 4. Scroll through the list of names to find the names for the two compounds you have been given and click on the name to display the NMR spectrum for each. In the NMR tables below, list the chemical shift, the splitting, and the number of hydrogens associated with each peak for each compound. Compare your answers to your predictions. **Not all slots must be filled** Peak Chemical Shift (d) Multiplicity 1 2 3 4 5