Chapter 12, Problem 12.34AP

Interpretation Introduction

(a)

Interpretation:

The compounds $\text{C}$ and $\text{D}$ are to be identified on the basis of IR spectra.

Concept introduction:

Infrared spectroscopy or vibrational spectroscopy deals with interaction of infrared radiation with matter. Its frequency ranges from $667-4000{\text{cm}}^{-1}$ . The wave number in vibrational spectroscopy is calculated as shown below.

$\tilde{\nu }=\frac{\text{1}}{\text{2πc}}\sqrt{\frac{k}{m}}$

Interpretation Introduction

(b)

Interpretation:

The compound ${\text{CDCl}}_{\text{3}}$ and ${\text{CHCl}}_{\text{3}}$ are to be distinguished on the basis of mass spectroscopy.

Concept introduction:

In mass spectroscopy, compounds are identified on the basis of mass of compound. When the compound breaks into fragments then they can be distinguished from the other compounds. This technique is also used to differentiate the isotopes of compounds. This technique does not involve electromagnetic radiations. Two peaks are used to identify the compound, the molecular ion which is the mass of the compound and base peak is the peak of most abundant element.