Aspirin can be prepared by the reaction of acetyl chloride with:

1. Benzoic acid
2. Phenol
3. p-Hydroxy benzoic acid
4. o-Hydroxy benzoic acid

Which of the following forms cationic micelles above a certain concentration:

1. Sodium acetate

2. Urea

3. Cetyl trimethylammonium chloride

4. Sodium dodecyl sulphonate 

Which of the following is not used for disinfection of drinking water:

1. Chlorine

2. Phenyl

3. Chloramine

4. Ozone