Match the following : Choose the correct answer from the options given below :GLC Detector Applicable Samples (a) Flame Ionization (i) Universal detector (b) Thermal Conductivity (ii) Halogenated compounds (c) Electron Capture (iii) Nitrogen and Phosphorus compound (d) Thermionic (iv) Hydrocarbons
(iv) (i) (ii) (iii)
(iv) (i) (ii) (iii) option is correct.
Gas-liquid chromatography (GLC) uses selective detectors matched to the analyte class. Flame Ionization Detector (FID) responds to any C-H containing species and is the workhorse for hydrocarbons. Thermal Conductivity Detector (TCD) is non-selective and treated as the classical universal detector. Electron Capture Detector (ECD) is exquisitely sensitive to electronegative substituents, especially halogens. The Thermionic (NPD/TSD) detector is optimised for nitrogen- and phosphorus-containing compounds.
Mapping the pairings gives (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii). The other permutations either swap the FID/TCD roles or misplace the halogen-specific ECD.
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