24:37

Part two CH15: reaction of AROMATIC COMPOUNDS

14:53

Ch20: amines

15:35

Ch17: carboxylic acid part 1

15:06

Ch16: aldehyde and ketones part 3

16:26

Ch17: carboxylic acid part 5

19:06

Mass spectroscopy part 1

12:46

Math Olympiad Problem | Geendle

14:45

Ch16: aldehyde and ketones part 2