Which of the following sweeteners is limited to use in soft drinks?

Two statements in respect of drug-enzyme interaction are given below.
Statement $I$: Action of an enzyme can be blocked only when an inhibitor blocks the active site of the enzyme.
Statement $II$: An inhibitor can form a strong covalent bond with the enzyme.
In the light of the above statements,choose the correct answer from the options given below.

Among the following,the incorrect statement about chloramphenicol is:

Which of the following is a tranquilizer?

Which one of the following statements is "not correct" about cationic detergents?

Which of the following compounds is an example of a hypnotic drug?