Oxidation of Primary Alcohols

Question 1

What product is formed when we oxidise a primary alcohol?

Answer 1

= aldehyde is made
= water is formed
= using one molecule of oxidising agent

Question 2

What is the oxidising agent for the oxidation of primary alcohols?

Answer 2

= acidified pottasium dichromate
= acidified sulfuric acid
= orange colour to green
K2Cr2O7/H+ or [O]

Question 3

What is the problem with this reaction?

Answer 3

= aldehydes are extremly easy to oxidise further
= if we want to make an aldehyde- remove from the reaction as soon as it forms
= the aldehyde could oxidise
= use an excess of alcohol and a limiting oxidising agent

Question 4

How can we remove the aldehyde?

Answer 4

= using distillation
= heat up the alcohol + oxidising agent: forms an alehyde
= aldehydes have a < boiling point than alcohols
= heat up and evpaporate the aldehyde, goes into a condenser and condenses in a seperate beaker

Question 5

What happens when an aldehyde is oxidised?

Answer 5

= they make a carboxylic acid
= requires excess oxidising agents
= heat under reflux-ensures all aldehyde has reacted, where it condenses repeatedly until so

Question 6

What mixture of liquids would there be?

Answer 6

= unreacted aldehygde and alcohol
= unreacted oxidisng agent
= can seperate COOH acid, higher boiling point as it can form hydrogen bonds
=

Question 7

What conditions are this done in?

Answer 7

= warm gently and distil out the aldehye as it forms