IR spectroscopy

Infrared is used in the following equipment, EXCEPT....

• Thermogun

• Microwave oven

• Remote control

• Electric heater

The range of IR radiation is....

• 200-400 nm

• 400-800 nm

• 700 nm - 1 mm

• 0.1 - 10 mm

IR spectroscopy can be used for the following qualitative analytical applications, EXCEPT.....

• Confirming identity of a sample

• Finding out what functional groups present in the sample

• Estimating the structural identity of a compound

• Calculating how much one compound is present in the sample

The basis of IR absorption is .................

• Electronic transition

• Vibrational transition

• Nuclear spin

• Rotational transition

The following affect vibrational frequency of a bond, EXCEPT.....

• Mass of the atoms

• Number of bonds

• Types of vibration (stretching/bending)

• Polarizability

When using IR spectrum to do structure elucidation, the first step to do is checking whether ........... group is present

• carbonyl

• nitro

• alkyl

• phenyl

Resonance effect as shown in the figure will cause C=O vibration to ...........

• have higher IR transmission

• move to lower frequency

• have same frequency as C-O vibration

• be IR inactive

Intermolecular hydrogen bonding will cause a fairly broad peak in......

• concentrated solution

• dilute sample

• sample containing long alkanes

• ketone compounds

The x-axis in mid IR spectrum is typically...............

• Transmission

• Absorbance

• Wavenumber

• Wavelength

Overtones typically have ...................... than their fundamental vibrations

• longer wavelength

• lower wavenumber

• higher absorbance

• higher frequency