Organic reaction mechanisms: addition, substitution and elimination

Sub-topic 1 2024 · Regional Championship Free

Naming the distinct monochlorination products of a branched alkane

Read past contest →

Sub-topic 2 2024 · National Preliminary Premium

Major product of alkane monochlorination via the most stable (tertiary) radical intermediate

Read past contest →

Sub-topic 3 2026 · National Preliminary Premium

Major product of alkane monochlorination via the most stable (tertiary) radical intermediate

Read past contest →

Sub-topic 4 2026 · National Preliminary Premium

Free-radical halogenation: initiation conditions, unpaired electrons and homolytic fission (true/false)

Read past contest →

Sub-topic 5 2026 · National Preliminary Premium

Free-radical halogenation: initiation conditions, unpaired electrons and homolytic fission (true/false)

Read past contest →

Sub-topic 6 2026 · National Preliminary Premium

Free-radical halogenation: initiation conditions, unpaired electrons and homolytic fission (true/false)

Read past contest →

Sub-topic 7 2025 · National Preliminary Premium

Addition vs substitution reactions of alkenes and alkanes with halogens (true/false)

Read past contest →

Sub-topic 8 2023 · National Preliminary Premium

Elimination reactions that form alkenes: dehydration, dehydrohalogenation and reduction

Read past contest →

Sub-topic 9 2012 · National Preliminary Premium

The carbocation: an organic species with a positive charge on carbon

Read past contest →

Sub-topic 10 2012 · National Preliminary Premium

The free radical: a species with an unpaired electron

Read past contest →

Sub-topic 11 2014 · National Final Premium

Riddle: vladimir markovnikov of markovnikov's rule

Read past contest →

Sub-topic 12 2018 · National Preliminary Premium

Balanced combustion equation for 2-methylheptane in excess air

Read past contest →

Sub-topic 13 2019 · National Preliminary Premium

Balanced combustion equation for 2-heptanone

Read past contest →

Sub-topic 14 2020 · National One-Eighth Premium

Methane and chlorine react under heat/light, not solely in the dark (true/false)

Read past contest →

Sub-topic 15 2021 · National Quarterfinal Premium

Balanced combustion equation for 3-octanone in excess air

Read past contest →

Sub-topic 16 2021 · National Quarterfinal Premium

Balanced combustion equation for heptane in excess air

Read past contest →

Sub-topic 17 2021 · National Quarterfinal Premium

Balanced combustion equation for hexanol in excess air, correcting a wrong molecular formula

Read past contest →

Sub-topic 18 2021 · National Quarterfinal Premium

Riddle: free-radical substitution, where chlorine reacts faster than bromine under uv light

Read past contest →

Sub-topic 19 2022 · National Preliminary Premium

True or false: alkanes undergo nucleophilic addition reactions

Read past contest →

Sub-topic 20 2022 · National Preliminary Premium

True or false: alkanes undergo electrophilic addition reactions

Read past contest →

Sub-topic 21 2022 · National Preliminary Premium

True or false: alkanes undergo electrophilic substitution reactions

Read past contest →

Sub-topic 22 2023 · National Preliminary Premium

Free-radical bromination product of butane, favoring the more stable secondary radical

Read past contest →

Sub-topic 23 2023 · National Preliminary Premium

Free-radical bromination product of 2-methylpropane, favoring the tertiary radical

Read past contest →

Sub-topic 24 2023 · National Preliminary Premium

Free-radical bromination product of 2,2-dimethylpropane, only primary hydrogens available

Read past contest →

Sub-topic 25 2023 · National Preliminary Premium

Dehydrohalogenation converts an alkyl halide to an alkene

Read past contest →