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SingaporeChemistryQuick questions
Analytical Techniques
Quick questions on Infrared spectroscopy and functional groups: Singapore A-Level H2 Chemistry
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is using the data booklet?Show answer
The SEAB Data Booklet lists characteristic absorption ranges. The most useful for identification:
What is the fingerprint region?Show answer
The region below about 1500 cm is the fingerprint region, a complex pattern unique to each molecule. It is not used to assign individual bonds but can confirm a compound's identity by matching against a known reference spectrum.
What is q1?Show answer
State the approximate wavenumber and the group responsible for the absorption that confirms a ketone. [2 marks]
What is q2?Show answer
Explain how the IR spectra of ethanol and ethanoic acid differ. [2 marks]
What is q3?Show answer
Explain why the fingerprint region is useful even though individual bonds in it are hard to assign. [2 marks]
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