Organic reactions - colour changes and reagents

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Preview of Organic reactions - colour changes and reagents

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Organic chemistry
Colour changes in reactions
Organic reagent Coloured reagent Colour change Reason
Alkene Potassium Purple to colourless The alkene turns
manganate into an alcohol (diol)
which is colourless.
Alkene Bromine water Yellow/brown to Br and OH group
colourless bromoalocohol.
Primary alcohol Potassium Orange to Dichromate
dichromate green/blue reduced to form
chromium ions.
Secondary alcohol Potassium Orange to Dichromate
dichromate green/blue reduced to form
chromium ions.
Chloroalkane Silver nitrate added Colourless to white Chlorine reacts with
when KOH reacts silver.
with chloroalkane
Bromoalkane Silver nitrate added Colourless to Bromine reacts with
when KOH reacts cream silver.
with bromoalkane
Iodoalkane Silver nitrate added Colourless to Iodine reacts with
when KOH reacts yellow silver.
with iodoalkane
Reagents in reactions
Mechanism Type Reagent Conditions
Free radical Substitution Cl2 UV light
Free radical Addition Initiator -
Electrophillic Addition HBr or Br2 Heat, acidic
conditions
Nucleophillic Substitution OH or KOH Heat, acidic
catalyst
- Hydrogenation H2 Nickel catalyst,
heat
- Alcohol to Alkene - Heat, acidic
catalyst

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