A strong signal at 3400 cm–1 in an IR spectrum indicates the presence of what type of bond? (you can refer to a table of characteristic absorptions)

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BlackTom AI · Accepted Answer

The question asks which bond type corresponds to a strong signal at 3400 cm–1 in an IR spectrum. This region is characteristic of O–H stretching vibrations, typically seen as a broad peak around 3200–3550 cm–1 depending on hydrogen bonding.
Option a: C–O. Carbon–oxygen single bonds generally show absorptions in the 1000–1300 cm–1 range, not near 3400 cm–1, so this choice does not align with the given wavenumber.
Option b: C–H. C–H stretches appear mainly near 2800–3000 cm–1 for aliphatic and arenes, and around 3000–3100 cm–1 for aromatic C–H; 3400 cm–1 is well outside typical C–H regions, making this option unlikely.
Option c: O–H. This is the classic signature at approximately 3400 cm–1, especially for alcohols and carboxylic acids, with broad appearance due to hydrogen bonding; this matches the prompt precisely.
Option d: C=O. Carbonyl (C=O) stretches are strong absorptions around 1650–1750 cm–1, not near 3400 cm–1, so this option is incorrect for the specified wavenumber.
In summary, the 3400 cm–1 signal most directly corresponds to O–H stretching, while the other bonds have characteristic absorptions in significantly different regions of the IR spectrum.

MUF0042 Chemistry Unit 2 - Semester 2, 2025 8.12 Quiz: IR Spectroscopy

A strong signal at 3400 cm–1 in an IR spectrum indicates the presence of what type of bond? (you can refer to a table of characteristic absorptions)

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