Q2 Questions

Question 1

Purpose of Refluxing

Answer 1

To heat the reaction mixture
To maximise yield
To speed up reaction
To prevent loss of solvent

Question 2

Two reactants and the solvent in Refluxing

Answer 2

Glyceryl tristearate
Sodium hydroxide
Ethanol

Question 3

What is an emulsion?

Answer 3

Fine dispersions of one liquid in a second liquid in which it is insoluble

Question 4

How is the clove oil isolated after liquid‐liquid extraction?

Answer 4

Evaporate the solvent

Question 5

Difference between Ethene and Ethyne

Answer 5

Ethyne flame smokier and more luminous than ethene

Ethene flame cleaner than ethyne’s

Question 6

Test for Unsaturation

Answer 6

Bromine water turns red to colourless

Acidified KMnO4 turns purple to colourless

Question 7

Test for Aldehydes

Answer 7

Add Tollens’ reagent
Heat test tube
A silver mirror is formed

Question 8

Appearance of Phenylmethanol at room temperature

Answer 8

Colourless

Question 9

Why Water is suitable for Recrystallization

Answer 9

Very soluble in hot but slightly soluble

Question 10

IUPAC name for glycerol

Answer 10

1,2,3-propanetriol

Question 11

Why is Ethanol used in Saponification

Answer 11

As a solvent