117989
Description
Flashcards by Ellie Hield, updated more than 1 year ago
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Created by Ellie Hield
over 12 years ago
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| Question | Answer |
| Oxidise a PRIMARY alcohol: what does it form - functional group? | Aldehyde C=O |
| Oxidise a PRIMARY alcohol: what must you do to prevent further oxidation? | Distil immediately |
| Oxidise a PRIMARY alcohol: what colour change occurs to what part of the reaction mixture? | Acidified dichromate ions (potassium dichromate) Orange to Green |
| Oxidise a PRIMARY alcohol: what must be present as part of the conditions of the reaction but do not affect the products? | K2Cr2O7 + H2SO4 |
| Oxidise a PRIMARY alcohol: What happens if you heat stronger under REFLUX with excess acidified dichromate? | Pass through aldehyde stage to carboxylic acid C=O l OH |
| Oxidise a SECONDARY alcohol: conditions? | K2Cr2O7 + H2SO4 + heat |
| Oxidise a SECONDARY alcohol: Product? Functional group? | Ketone C ll O in middle of molecule (where OH group was) |
| Can you oxidise a tertiary alcohol? | no |
| Conditions for ESTERIFICATION? | warm acid catalyst - usually conc. sulphuric |
| DEHYDRATION of an alcohol (primary or secondary): what are the possible catalysts? conditions? | Conc. H2SO4 / Conc. H3PO4 heat reflux |
| what do you form when you dehydrate an alcohol? | alkene + water |
| Conditions for Fermentation? | Yeast 37 degrees C |
| Fermentation Equation? | C6H12O6(aq) --> 2CH3CH2OH(aq) + 2CO2 |
| Why do alcohols dissolve in water? | Hydrogen bonds form between the polar OH groups of the alcohol and water molecules |
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