Off-by-one in the count
Counts the intervals where the stem counts the endpoints, or the reverse.
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Find the decision that makes a wrong option feel right.
Answer one question. See the misconception behind every option. Rebuild the method with hints and prove the correction on a fresh question.
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Browse Concept Traps
11 Concept Traps
Answered the equation, not the question
Solves the equation correctly, then reports that value instead of the quantity the stem asked for.
Right formula, wrong slot
Recalls the correct relation and substitutes a quantity into the wrong slot.
The power in the proportionality
Keeps the dependence but not its power — treats a square or square-root relation as linear or inverse.
Sign convention flip
Carries a sign convention chosen at the start into a term where the convention reverses.
Reagent behaves the same for everyone
Assumes a reagent behaves identically for every substrate class.
d-count without the oxidation step
Counts d electrons from the neutral atom, skipping the oxidation state — or assumes ligand strength.
The periodic-trend exception
Applies a periodic trend straight through an exception the trend does not cover.
Picked true when asked false
Selects a factually true option because it is correct, missing that the prompt asked for the incorrect statement.
Conjugation ignored in elimination regiochemistry
Eliminates toward the less substituted or unconjugated position instead of forming the more stable conjugated system.
Domain exclusion omitted
Includes excluded boundary or singular points when defining the solution set or evaluating cardinality.
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Progress based on proof
A pattern is not “fixed” because you read a solution.
- DetectedA first answer reveals the decision.
- CorrectedYou rebuild the method.
- Proved nowA fresh question transfers it.
- Proof dueTime checks whether it held.
- StableIndependent answers hold across sessions.