Which of the following tranquilizers cannot be part of sleeping pills?

Chlordiazepoxide Amytal Seconal Nembutal

Chlordiazepoxide

Amytal, seconal and nembutal are examples of barbiturates or sleep-inducing drugs. These are hypnotic compounds barbituric acid and are important tranquilizers and components of sleeping pills. Chlordiazepoxide is a mild tranquilizer used only for relieving tension.