Which class of drugs is used in sleeping pills?

Which of the following is $NOT$ an example of a synthetic detergent?

Substance used for the preservation of coloured fruit juices is

Given below are two statements,one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Butylated hydroxy anisole when added to butter increases its shelf life.
Reason $R$: Butylated hydroxy anisole is more reactive towards oxygen than food.
In the light of the above statements,choose the most appropriate answer from the options given below:

Which amongst the following is not a pesticide?

Which of the following is not a broad-spectrum antibiotic?