oxidise an alcohol (1 or 2) with acidified potassium dichromate/ dichromate ion is reduced/ colour change from orange to green
1 of 11
Describe the oxidation of a primary alcohol to an aldehyde
reaction has to be controlled as too much [o] can result in an COOH/ controlled conditions/ remove aldehyde as soon as formed/ gently heat OH with controlled count of [o] and acid in distillation apparatus
2 of 11
Outline distillation apparatus
...
3 of 11
Describe the oxidation of a secondary alcohol
OH heated under reflux
4 of 11
Outline reflux apparatus
...
5 of 11
Describe the formation of carboxylic acids from aldehydes - why is it done under reflux?
oxidation/ heated under reflux/ excess [o]/ reflect enables temps to be risen w/o loosinh volatile solvents/ any vaporised compounds cool condense and drip back in
How can a carbonyl compound be identified from 2,4-DNP ppt?
ppt is a derivative of the carbonyl compound/ each compound produces a different derivative with a different melting point/ compared against known mp it can be identified
9 of 11
What is Tollens' reagent? what is it used for?
colourless solution of silver nitre (AlNO3) dissolved in aqueous ammonia/ distinguish between aldehydes and ketones/ ammoniacal silver nitrate
10 of 11
Outline the Pollens' test
aldehydes can be oxidised into COOH/ Tollens' [o] heated in a test tube/ if aldehyde present silver mirror is fomred/ Ag+ reduced to Ag (s)
11 of 11
Other cards in this set
Card 2
Front
Describe the oxidation of a primary alcohol to an aldehyde
Back
reaction has to be controlled as too much [o] can result in an COOH/ controlled conditions/ remove aldehyde as soon as formed/ gently heat OH with controlled count of [o] and acid in distillation apparatus
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