AQA A Level Chemistry復習筆記3.5.1 Classifying Alcohols
Classification of Alcohols
- Primary?alcohols?are alcohols in which the carbon atom bonded to the -OH group is attached to?one?other carbon atom (or alkyl group)
- Secondary?alcohols?are alcohols in which the carbon atom bonded to the -OH group is attached to?two?other carbon atoms (or alkyl groups)
- Tertiary?alcohols?are alcohols in which the carbon atom bonded to the -OH group is attached to?three?other carbon atoms (or alkyl groups)
Classifying primary, secondary and tertiary alcohols and alcohols with more than one alcohol group
- Only?primary?and?secondary?alcohols?can get oxidised when?mildly oxidised?with acidified K2Cr2O7
- Primary alcohols get mildly oxidised to aldehydes
- Secondary alcohols get mildly oxidised to ketones
- Tertiary?alcohols?do?not?undergo oxidation with acidified K2Cr2O7
- Therefore, only the oxidation of primary and secondary alcohols will change the colour of K2Cr2O7?solution as the?orange?Cr2O72-?ions are reduced to?green?Cr3+?ions
Only primary and secondary alcohols can be oxidised, turning the orange solution green
No colour change is observed with a tertiary alcohol
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