Which of the following is a chlorine-containing artificial sweetener?

An artificial sweetener $X$ is a halogen-containing compound and artificial sweetener $Y$ is a sulphur-containing compound. $X$ and $Y$ respectively are:

Which of the following is $NOT$ correctly matched?

Which of the following statements is incorrect?

How does the branching of the hydrocarbon chain of synthetic detergents affect their biodegradability?

Low level of noradrenaline is the cause of depression. What type of drugs are needed to cure this problem? Name two drugs.