Unit 4: How are organic compounds categorised, analysed and used?
5 dot points across 3 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.
What is the chemistry of food?
How can organic compounds be analysed?
- the principles and interpretation of mass spectrometry (molecular ion peak, fragmentation pattern, M+1 isotope peaks) and infrared (IR) spectroscopy (characteristic absorption bands of functional groups) for the identification of organic compounds
A focused VCE Chemistry Unit 4 answer on mass spectrometry and IR spectroscopy. Covers the molecular ion peak and fragmentation in MS, isotope clues (M+1 for C, M+2 for Cl/Br), the characteristic IR bands for O-H, N-H, C=O, C-O and C-H, and the combined workflow for identifying organic compounds.
9 min answer → - the principles and interpretation of proton (^1H) and carbon-13 (^13C) NMR spectroscopy (chemical shift, integration, n+1 splitting and number of carbon environments) and high performance liquid chromatography (HPLC, retention time and calibration curves) for the identification and quantification of organic compounds
A focused VCE Chemistry Unit 4 answer on proton and carbon-13 NMR, and HPLC. Covers TMS reference and chemical shift, number of environments, the n+1 splitting rule with examples, integration, ^13C NMR for counting carbon environments, and HPLC retention time with quantitative calibration curves.
9 min answer →
How can the diversity of carbon compounds be explained and categorised?
- structures, IUPAC nomenclature and properties of the main organic families (alkanes, alkenes, haloalkanes, alcohols, aldehydes, ketones, carboxylic acids, esters, amines and amides) and the recognition of structural isomers (chain, position and functional-group isomers)
A focused VCE Chemistry Unit 4 answer on organic chemistry foundations. Covers the main functional groups (alkane, alkene, haloalkane, alcohol, aldehyde, ketone, carboxylic acid, ester, amine, amide), IUPAC naming rules including parent chain and locants, primary/secondary/tertiary classification, and the three types of structural isomerism.
9 min answer → - characteristic reactions of organic families including substitution (haloalkanes from alkanes and from alcohols), addition (alkenes), oxidation (alcohols to aldehydes/ketones/carboxylic acids), condensation (esterification) and hydrolysis (of esters and amides), and the design of multi-step reaction pathways linking functional-group families
A focused VCE Chemistry Unit 4 answer on organic reactions. Covers substitution of alkanes and alcohols, addition to alkenes, oxidation of primary and secondary alcohols, esterification by condensation, hydrolysis of esters and amides, and the construction of multi-step reaction pathways with reagents and conditions.
9 min answer →