IB Chemistry HL 3.2.9 Hl Infrared Spectroscopy Questions

Use real IR spectra to match absorption bands to bond types, interpret the functional-group region and justify structures from data-booklet ranges.

Exam points

Identify the bond responsible for a supplied IR absorption by matching its wavenumber to the characteristic data-booklet range.
Interpret the functional-group region and absent or present bands to identify hydroxyl, carbonyl, C=C, C–H, N–H, C–O or halogen bonds.
Compare or identify compounds from complete IR spectra by combining multiple absorption bands, the fingerprint region and structural constraints.

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Study 3.2.9 (HL)—Infrared spectroscopy conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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Urea, $\left(\mathrm{H}_{2} \mathrm{~N}\right)_{2} \mathrm{CO}$ , is excreted by mammals and can be used as a fertilizer.

The IR spectrum of urea is shown below.

Figure for Question IB Chemistry HL 3.2.9 Hl Infrared Spectroscopy Questions question 1 — IB Chemistry HL

Identify the bonds causing the absorptions at $3450 \mathrm{~cm}^{-1}$ and $1700 \mathrm{~cm}^{-1}$ using section 26 of the data booklet.

$3450 \mathrm{~cm}^{-1}$ :

$1700 \mathrm{~cm}^{-1}$ :

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IB Chemistry HL 3.2.9 Hl Infrared Spectroscopy Questions question 1