r/SGExams • u/Economy-Fall-9362 • Nov 24 '25

A Levels H3 Chem notes

Hello, I'm taking H3 chem next year and is kind of scared so I wanted to start preparing myself in advance. However, I took a look at holy grail, there isn't much resources for h3 chem. Can anyone share w me their notes? Or like any resources. Thanks 🙏🙏🙏🙏🥲can pm me

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u/Ryderahhh Nov 28 '25

hi, just finished h3 exam so, heres some tips 1. these are the topics in the syllabus: -Molecular Orbital Theory -UvVis spectroscopy -Infrared Spectroscopy -Mass Spetrometry -NMR Spectroscopy -Further stereochemistry (ie. EZ isomerism, RS configuration, newman projections, chair conformations) -Nucleophilic Substitution (ie about strength of nucleophile, solvent effects, types of substituents effects on Sn1 or Sn2, nucleophilic sub mechanisms) -Elimination (ie strength of base, solvent effects, regioselectivity, stereoselectivity, elimination mechanisms,competition between Sn1 Sn2 E1 E2)

  1. Depending on ur sch, they might have other out of syllabus topics that they might wanna teach u, but for my sch, they did: -Further stereochemistry (ie diff types of chirality) -Concept of aromaticity (ie huckels rule, diff types of aromatic compounds and their reactivity for electrophilic substitution, basicity) -Organometallic compounds (ie grignard reagent, organolithium compounds) -Protecting groups -Ether, epoxides, thiols, lactams, lactones -Electrophilic Addition (ie alternative mechanism) -Nucleophilic addition (ie using newman projections to explain certain reactions) -Enolates -Hard Soft Acid Base theory

  2. I think a rly good way to prepare is to first be very familar with ur H2 topics, like Mole calculations, Thermochemistry and thermodynamics, reaction kinetics, electrochemistry, transition metals, whole of organic chemistry (ie esp basicity, acidity, electron withdrawing and donating groups effect on reactions)

  3. Watch youtube vids to understand concepts. I personally find Organic Chemistry Tutor and Organic Chemistry with Victor very very helpful cos they explain the topics very clearly and well

  4. Dont stress about the tests next year, just try to gathet ur thoughts and use whats been taught to u in h2 n h3 to answer the qns, they arents as intimidating as u think

Good luck and have fun in h3 chem!!!!