Question: What is the Class IC flammable liquid with the least observable adverse effect level that contains Carbon?
Paraphrase: What is the Class IC flammable liquid with the least observed level of carbon - containing adverse effects?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q21009056 . ?ent wdt:P2717 ?obj . ?ent wdt:P527 wd:Q623. } ORDER BY ASC(?obj)LIMIT 5 
Answer: chlorobenzene