How many letters does the top answer for “any group or radical of the form rco- where r is an organic group” have?

The most common answer is acyl (4 letters).

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Crossword clue: any group or radical of the form rco- where r is an organic group

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

acyl 4 letters wn-def

any group or radical of the form RCO- where R is an organic group

Pattern

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)