Tests

Question 1

Alkenes

Answer 1

decolourisation of bromine water

Question 2

Aldehyde

Answer 2

1. Add fehling’s
2. brick red ppte formed
   OR
3. add tollen’s reagent
4. silver mirror formed

Question 3

Ketone

Answer 3

1. +ve result with 2,4-DNPH
2. negative tollen’s/fehling’s

Question 4

Carboxylic acid

Answer 4

1. add carbonate
2. bubble gas through limewater
3. cloudy is indicative of +ve result

Question 5

Haloalkane

Answer 5

1. Add nitric acid
2. Add silver nitrate
3. ppte formed = haloalkane present

Question 6

Carbonyl

Answer 6

1. Add 2,4-DNPH
2. orange to yellow is indicative of +ve result

Question 7

Methylcarbonyl

Answer 7

1. add iodine and NaOH
2. medical smell and pale yellow ppte indicative of +ve result

Question 8

Carbon dioxide

Answer 8

1. Bubble through limewater
2. Cloudy is indicative of +ve result

Question 9

Ammonia

Answer 9

Bleaches damp, blue litmus paper

Question 10

Primary/Secondary alcohols

Answer 10

turns H+/K2Cr2O7 orange to green

Question 11

Sulphate ions

Answer 11

1. Add HCl and BaCl2
2. White ppte forms if ions present