Which chemical class uses the example Chloroethane (ethyl chloride)?
CREATE TABLE table_name_90 (
    chemical_class VARCHAR,
    example VARCHAR
)
SELECT chemical_class FROM table_name_90 WHERE example = "chloroethane (ethyl chloride)"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Which chemical class uses the example Chloroethane (ethyl chloride)? ### Input: CREATE TABLE table_name_90 (
    chemical_class VARCHAR,
    example VARCHAR
) ### Response: SELECT chemical_class FROM table_name_90 WHERE example = "chloroethane (ethyl chloride)"