Spectroscopy

Absorption band at 2100 cm-1 to 2300 cm-1 shows the presence of

• Double bond region

• Triple bond region

• Carbonyl functional group region

• Single bond region

Stronger bonds absorb IR at

• higher wavenumbers

• lower wavenumbers

• in the fingerprint region

• 600 cm-1

What part of the atom or molecule does infrared radiation affect

• The nucleus

• The electrons

• The bonds

• The charge

The greater the polarity of a bond, the_____ its IR absorption

• weaker

• stronger

• more charged

• smaller the wavenumber

Non polar symmetrical molecules

• Do not absorb IR radiation

• Absorb IR radiation

• Absorb the most Ir radiation

• Transmit IR radiation

Absorption band at 1600 cm-1 to 1850 cm-1 shows the presence of

• Triple bonds

• double bonds

• X-H

• single bonds

Absorption band at 2700 cm-1 to 4000 cm-1 shows the presence of

• Fingerprint region

• double bond

• triple bond

• X-H

Absorption band at 2900 cm-1 shows the presence of

• Sp3

• Sp2

• Sp

• ketone

Absorption band at 3100 cm-1 shows the presence of

• Sp3

• Sp2

• Sp

• OH group

Absorption band at 3300 cm-1 shows the presence of

• Sp3

• Sp2

• Sp

• Amine