2. oxidation of alcohols

Question 1

combustion of alcohol

1. what colour flame
2. equation (ethanol)

Answer 1

1. pale blue

2. C2H5OH(l) + 3O2(g) -> 2CO2(g) + 3H2O(g)

Question 2

oxidising agent used to mildly oxidise alcohols

Answer 2

acidified dichromate (VI) 
K2Cr2O7/H2SO4

Question 3

using acidified dichromate (VI)

primary alcohols oxidised to

Answer 3

aldehydes then carboxylic acids

Question 4

using acidified dichromate (VI)

secondary alcohols oxidised to

Answer 4

ketones

Question 5

acidified dichromate (VI) 
tertiary alcohols oxidised to

Answer 5

wont be oxidised

Question 6

general formula of aldehydes and ketones (carbonyls)

Answer 6

Cn H2n O

Question 7

aldehydes have

Answer 7

1 H and 1 alkyl group attached to carbonyl carbon

Question 8

ketones have

Answer 8

2 alkyl attached to carbonyl atom

Question 9

the orange dichromate (VI) ion is reduced to

Answer 9

green chromium (III) ion Cr3+

Question 10

equation for oxidation of primary alcohols

Answer 10

RCH2OH + [O] -> RCHO + H2O aldehyde

RCHO + [O] -> RCOOH carboxylic acid

Question 11

apparatus for primary alcohol ->

1. aldehyde
2. carboxylic acid

Answer 11

1. distillation apparatus

2. reflux

Question 12

equation for oxidation of secondary alcohol

Answer 12

RRCHOH + [O] -> RCOR+ H2O ketone

Question 13

apparatus for secondary alcohol -> ketone

Answer 13

reflux

Question 14

the only way to oxidise tertiary alcohols is

Answer 14

burning them