Spectroscopic analysis

UV-Visible spectroscopy is observed in the region

• 190-400nm and 400-800nm

• 667-4000cm-1

• 70eV-6000kjmol-1

• 60-3000MHz

Which region of the electromagnetic spectrum has the longest wavelength?

• ultraviolet

• infrared

• radio

• visible

What information can be obtained from the number of peaks in the H NMR spectrum of a compound?

• The number of different chemical environments occupied by the protons in one molecule of the compound.

• The number of hydrogen atoms in one molecule of the compound.

• The number of different functional groups in one molecule of the compound

• the number of carbon atoms in one molecule of the compound

This causes molecules to increase their rotational energy which gives information about bond lengths.

• radio waves

• microwaves

• infrared radiation

• X rays

It causes a bond to stretch or bend.

• radio waves

• microwaves

• infrared radiation

• X rays

Identify the bonds which will produce strong absorptions in the IR region of the electromagnetic spectrum.

I. C - O bond

II. C = C bond

III. C = O bond

• I and II only

• I and III only

• II and III only

• all of the above

Hydrogen nuclei in different chemical environments have different chemical shifts.

• True

• False

It is the standard used in nuclear magnetic resonance spectroscopy.

• methyl propane

• tetramethylsilane

• benzene

• sulfuric acid

IR spectroscopy is applied in

• Identification of the Functional group

• •Determination of Structure

• •Testing Purity of a compound

• All of the above

The applications for UV spectroscopy are

• Detection of Conjugation

• Detection of geometrical isomers

• Detection of functional Groups

• All the above