Select the statement that is not true about the carboxylic acid and amide functional groups and their infrared absorptions. Carboxylic carbonyl: 1710-1780 cm-1 Amide carbonyl: 1630-1690 cm-1
(a) When either of these functional groups absorbs infrared radiation, the excitation of an electron to an antibonding orbital is not occurring.
(b) The carboxylic acid absorbs higher energy infrared radiation.
(c) The difference in infrared absorptions of the different carbonyl groups (C=O) is consistent with the amide group having the stronger C=O bond.
(d) The absorption of infrared radiation by the C=O group causes the carbon and oxygen atoms to vibrate with an increased amplitude.
(e) The infrared absorptions of carboxylic acid and amide functional groups can be used to indicate the presence of these functional groups in organic molecules.
(c) is correct as you can infer from the values given. My question was regarding 'anti-bonding' orbitals. Are electrons having similar spin found in anti-bonding orbitals?
(a) When either of these functional groups absorbs infrared radiation, the excitation of an electron to an antibonding orbital is not occurring.
(b) The carboxylic acid absorbs higher energy infrared radiation.
(c) The difference in infrared absorptions of the different carbonyl groups (C=O) is consistent with the amide group having the stronger C=O bond.
(d) The absorption of infrared radiation by the C=O group causes the carbon and oxygen atoms to vibrate with an increased amplitude.
(e) The infrared absorptions of carboxylic acid and amide functional groups can be used to indicate the presence of these functional groups in organic molecules.
(c) is correct as you can infer from the values given. My question was regarding 'anti-bonding' orbitals. Are electrons having similar spin found in anti-bonding orbitals?
