What is the class IC flammable liquid with the least ions attached to carbon?
select ?ent where { ?ent wdt:P31 wd:Q21009056 . ?ent wdt:P2260 ?obj . ?ent wdt:P527 wd:Q623} ORDER BY ASC(?obj)LIMIT 5 
class ic flammable liquid: Q21009056 carbon: Q623