Question

the hydrocarbons of still higher boiling - point which remain in the still are used as burning ______ for lamps.
parquet
naphtha
helium
shellac

Explanation:

Parquet is a flooring material, helium is a gas not a hydrocarbon - based fuel, and shellac is a resin. Naphtha is a hydrocarbon mixture and can be used as a burning fuel for lamps.

Answer:

B. naphtha