Alcohols

Question 1

Name 4 conditions for fermentation

Answer 1

1. yeast catalyst
2. anaerobic conditions
3. 35 degrees temperature
4. 1 atm pressure

Question 2

What are primary alcohols oxidised to? and name the oxidising agent and state if it under reflux or distillation

Answer 2

1. Aldehydes + H2O
2. acidified potassium dichromate
3. Distillation

Question 3

What are secondary alcohols oxidised to? and name the oxidising agent and state if it under reflux or distillation

Answer 3

1. ketones
2. acidified potassium dichromate
3. reflux

Question 4

What does reflux mean?

Answer 4

the vapour condenses and drips back into the flask

Question 5

What is tollens reagent?

Answer 5

A solution of silver nitrate in aqueous ammonia

Question 6

Describe a test for aldehydes using tollens reagent

Answer 6

Warm substance with tollens reagent and if aldehyde is present silver mirror forms

Question 7

Describe a test for aldehydes using fehlings reagent

Answer 7

Warm substance with fehlings reagent and if aldehyde then brick red precipitate forms

Question 8

Describe and name the reaction when hot sulfuric acid reacts with the right type of alcohol

Answer 8

dehydration. water is formed by the OH reacting with a H on a neighbouring carbon to form an alkene