Chapter 10, Organic Analysis

Question 1

Alkenes

Answer 1

Bromine Water Test

Decolourises

Question 2

Haloalkanes

Answer 2

Warm with NaOH, acidify with HNO3, then add AgNO3
Precipitate forms (white, cream & yellow)

Question 3

Alcohols 1

Answer 3

Acidified Potassium Dichromate
Primary/Secondary alcohols turn it from orange to green
Tertiary alcohols give no reaction

Question 4

Alcohols 2

Answer 4

Warm with ethanoic acid in presence of conc sulfuric acid

Sweet smell of an ester

Question 5

Aldehydes 1

Answer 5

Warm with Tollens Reagent

Colourless solution goes to s silver mirror precipitate

Question 6

Aldehydes 2

Answer 6

Warm with Fehlings Solution

Changes from blue liquid to red precipitate Cu2+ goes to Cu2O

Question 7

Aldehydes 3

Answer 7

Acidified Potassium Dichromate

Turns from orange to green

Question 8

Carboxylic Acid 1

Answer 8

Aq sodium hydrocarbonate

Fizzing due to CO2

Question 9

Carboxylic Acid 2

Answer 9

Warm with ethanol in presence of conc sulphuric acid

Sweet smell of an ester

Question 10

Acyl Chlorides

Answer 10

Aq silver nitrate solution

Vigorous reaction, a white precipitate of silver chloride is produced