Sub-topic 1
2026 · National Preliminary
Free
Constitutional isomers of a haloalkane (c5h11cl) with an alkyl substituent
Read past contest →
Sub-topic 2
2026 · National Preliminary
Premium
Constitutional isomers of a haloalkane (c5h11cl) with an alkyl substituent
Read past contest →
Sub-topic 3
2026 · National Quarterfinal
Premium
Systematic name of the alkane isomer with the shortest possible parent chain
Read past contest →
Sub-topic 4
2026 · National One-Eighth
Premium
Counting structural isomers of an alkane
Read past contest →
Sub-topic 5
2024 · National One-Eighth
Premium
Problem of the day: naming structural isomers of a bromo-substituted alkene
Read past contest →
Sub-topic 6
2024 · National One-Eighth
Premium
Systematic name of an alkyl-substituted bromoalkane isomer
Read past contest →
Sub-topic 7
2026 · National Preliminary
Premium
Systematic name for a structural isomer of butane (2-methylpropane)
Read past contest →
Sub-topic 8
2026 · National Preliminary
Premium
Systematic name for a structural isomer of butane (2-methylpropane)
Read past contest →
Sub-topic 9
2026 · National Preliminary
Premium
Systematic name for a structural isomer of butane (2-methylpropane)
Read past contest →
Sub-topic 10
2013 · National Quarterfinal
Premium
Cis-trans isomerism is a form of stereoisomerism (true/false)
Read past contest →
Sub-topic 11
2013 · National Quarterfinal
Premium
Mirror-image compounds are generally enantiomers (true/false)
Read past contest →
Sub-topic 12
2013 · National Quarterfinal
Premium
Cis-trans isomerism is not a form of positional isomerism (true/false)
Read past contest →
Sub-topic 13
2013 · National Semifinal
Premium
Restricted rotation about a c=c bond enabling cis/trans stereoisomers
Read past contest →
Sub-topic 14
2014 · National Quarterfinal
Premium
Cis/trans stereoisomers of 2-pentene
Read past contest →
Sub-topic 15
2022 · National Preliminary
Premium
True or false: c4h8 has only two isomers (but-1-ene and but-2-ene)
Read past contest →
Sub-topic 16
2022 · National Preliminary
Premium
True or false: c4h8 has 4-bromobutane as an isomer
Read past contest →
Sub-topic 17
2022 · National Preliminary
Premium
True or false: c4h8 has 2-bromo-2-methylbutane as an isomer
Read past contest →
Sub-topic 18
2023 · National Preliminary
Premium
Identifying a carbonyl-containing isomer of c4h8o
Read past contest →
Sub-topic 19
2023 · National One-Eighth
Premium
Problem of the day: five optically-active isomers of c6h13br
Read past contest →