IR spectroscopy

What is the range of finger print region?

• 2000cm-1 to 1660cm-1

• 1500cm-1 to 400cm-1

• 2550cm-1 to 2000cm-1

• 3600cm-1 to 2870cm-1

Absorption band at 2100cm-1 to 2500cm-1 shows the presence of

• Double bond region

• Triple bond region

• Carbonyl functional group region

• Fingerprint region

What part of the atom or molecule does infrared radiation affect

• the nucleus

• the electrons

• the  bonds

• the charge

The independent variable on an IR spectra is 

• wave length 

• wave number

• frequency squared

• transmission

The dependent variable on an IR spectra is 

• wave length 

• wave number

• frequency

• transmission

The finger print region is 

• different for each organic compound

•  from 600 - 1400 cm^-1

• both the above

The actual wavelength which is absorbed by any bond can vary.  

• True

• False

what is the unit for measuring infrared radiation

• cm-1

• mm-1

• Kg

• L

Stronger bonds absorb IR at

• higher wavenumbers

• lower wavenumbers

• in the finger print region

• 600cm^-1

Bond stretching frequencies depend on two major factors, namely atomic weight and bond stiffness. The frequency absorbed is directly proportional to the bond strength (stiffness) but inversely proportional to the atomic weight. Which of the following bonds will give the highest absorption frequency value?

• C triple bond C

• C Double bond C

• C Single bond C

• all will give the same value