Asked by muhammad abdullmageed on Sep 24, 2024

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While the carbonyl stretching frequency for simple aldehydes, ketones, and carboxylic acids is about 1710 cm-1, the carbonyl stretching frequency for amides is about ________.

A) 1700 cm-1
B) 1735 cm-1
C) 1800 cm-1
D) 1660 cm-1
E) 2200 cm-1

Carbonyl Stretching

A vibrational mode observed in infrared spectroscopy, indicative of the C=O group's stretching within a molecule.

Amides

Organic compounds characterized by a carbonyl group (C=O) attached to a nitrogen atom, forming part of the structure of proteins and other important molecules.

1710 cm^-1

This refers to the typical absorption band in infrared spectroscopy for carbonyl (C=O) stretching in aldehydes, ketones, and carboxylic acids.

  • Associate IR stretching frequencies to distinct functional groups within organic substances.
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JI
Jebran Inzunza3 days ago
Final Answer :
D
Explanation :
The carbonyl stretching frequency for amides is lower than that for simple aldehydes, ketones, and carboxylic acids due to resonance stabilization of the amide carbonyl group, which reduces the double bond character of the C=O bond, leading to a frequency around 1660 cm^-1.