Discussion
What does a flame ionisation detector respond to?
Answer: D
Organic compounds burn in a hydrogen flame and produce ions in proportion to the carbon they contain, and the resulting current is measured. The other options describe thermal conductivity, electron capture and absorbance detectors. Because the response tracks carbon content, it is nearly universal for organic compounds and nearly blind to water, carbon dioxide and the permanent gases - which is convenient or limiting depending on what is sought.
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