Module 4 and 6 (paper 2 & 3)

Question 1

Functional group: Alkene

Answer 1

Chemical Test: Br₂
Orange to colourless

Question 2

Functional group: Haloalkane

Answer 2

Chemical Test: AgNO₃ in ethanol, 50°C
AgCl white precipitate, soluble in dilute NH₃
AgBr cream precipitate, soluble in conc. NH₃
AbI yellow precipitate, insoluble in NH₃

Question 3

Functional Group: Phenol

Answer 3

Chemical Test: Na₂CO₃
No fizzing, weak acidity

Chemical Test: Br₂
Orange to colourless with white precipitate

Question 4

Functionl Group: Carbonyl (aldehyde or ketone)

Answer 4

Chemcial Test: 2.4-DNPH
Orange precipitate

Question 5

Functional Group: Aldehydes

Answer 5

Chemical Test: Tollens reagent
Silver mirror

Question 6

Functional Group: 1° or 2° alcohol or aldehyde

Answer 6

Chemical Test: K₂Cr₂O₇ and H₂SO₄, heat
Orange to green

Question 7

Functional Group: Carboxylic acid

Answer 7

Chemical Test: Na₂CO₃
Fizzing