3.6 Organic Analysis

Question 1

What kind of alcohol forms an aldehyde when oxidised?

Answer 1

Primary alcohol

Question 2

What kind of alcohol forms a ketone when oxidised?

Answer 2

Secondary alcohol

Question 3

Fehling’s solution and Benedict’s solution can be used to distinguish between aldehydes and ketones. What colour does the blue solution become when an aldehyde is added?

Answer 3

Red

Question 4

Fehling’s solution and Benedict’s solution can be used to distinguish between aldehydes and ketones. What colour does the blue solution become when a ketone is added?

Answer 4

Stays blue - no change

Question 5

Tollens reagent is a mixture of silver nitrate, sodium hydroxide and ammonia. What functional group compound must have been added for a silver coating to form on the walls of the test tube?

Answer 5

An Aldehyde

Question 6

When an Alkene is added to an orange solution it becomes colourless. What solution?

Answer 6

Bromine Water

Question 7

What can sodium carbonate be used to test for?

Answer 7

Carboxylic acids

Question 8

What 3 solutions are needed to create Tollens reagent?

Answer 8

Sodium hydroxide, ammonia and silver nitrate

Question 9

Name the gas that’s produced when a Carboxylic acid reacts with sodium carbonate

Answer 9

Carbon dioxide

Question 10

What is used to oxidise alcohols?

Answer 10

Acidified potassium dichromate