ChemVerify — Instant IUPAC Naming & Stereochemistry Checker
Verify organic chemistry IUPAC names and R/S stereodescriptors instantly. AI chatbots get naming and stereochemistry wrong more often than expected — this checker uses a deterministic, rule-based CIP engine instead of a language model guess.
What is the IUPAC name of the structure with molecular formula C4H10?
butane. Step 4 — Assemble the name: the parent core is "butane". There are no substituents to cite, so that's the complete name.
What is the IUPAC name of the structure with molecular formula C4H9Cl?
(2R)-2-chlorobutane. Stereocenter at C2: its four attached groups rank Cl (1st) > C (2nd) > C (3rd) > H (4th) by CIP priority (where two groups share the same directly-attached atom, the tie was broken by looking further out along that branch). Viewed from the side opposite the lowest-priority group (H), priority 1→2→3 runs clockwise, so C2 is (R).
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