Alcohols

Question 1

What is a primary alcholhol

Answer 1

Where the carbon attached to the oh group is attached to one other carbon

Question 2

What is a secondary alcohol

Answer 2

Where the carbon attached to the OH group is attached to two carbons

Question 3

What happens to soluability as chain length of alcohol’s increases

Answer 3

Reduces as the overall polarity of the molecule decreases

Question 4

Substitution of OH with a halide ion to make a haloalkane

Answer 4

Requires an acid such as H2SO4

OH group is replaced by the halide ion and the OH- ion is added to the other ion

eg: NaBr —– Na OH

Question 5

Dehydration of alcohols

Answer 5

This is an elimination reaction of water

Mixed with an acid catalyst (H3PO4) and heated

The OH group combines with an adjacent Hgroup to form water and is released forming a double bond

There is usually 2 sides that this can occur on making 2 possible products

Question 6

Oxidisation of primary alcohols

Answer 6

Using acidified potassium dichromate (K2Cr2O7/ \H+)

[O] distil ——- aldehyde
2[O] reflux —— carboxylic acid

Question 7

Oxidation of secondary alcohols

Answer 7

Using acidified potassium dischrtomte (K2Cr2O7/H+)

[O] reflux —– ketone

Question 8

Cna tertiary alcohol be oxidise

Answer 8

absaloutly not