Chloral, also called trichloroacetaldehyde (CCl₃CHO), is a colorless, oily liquid made by reacting chlorine and ethanol or acetaldehyde, used chiefly in the manufacture of DDT. Molecular weight 147.4, melting point -57.5°C.

Chloral hydrate (CCl₃CH(OH)₂) is a colorless, crystalline solid made by reacting chloral and water and used as a sedative, as it is a depressant of the central nervous system. It is toxic in excess, and especially when mixed with alcohol to give make "Mickey Finns" or "knockout drops." Habitual use produces drug addiction and gastritis. Melting point 57°C.