Reactions of Alcohols

Ellie Hield
Flashcards by Ellie Hield, updated more than 1 year ago
Ellie Hield
Created by Ellie Hield about 8 years ago
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A-Levels Chemistry Flashcards on Reactions of Alcohols, created by Ellie Hield on 06/01/2013.

Resource summary

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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