Tests for Organic Functional Groups OCR Chemistry A

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What are the reagents and observations when testing for alkenes?
Add a few drops of bromine water and shake well. If an alkene is present the bromine water decolourises
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What are the reagents and obervations when testing for haloalkanes?
Add aqueous silver nirate and ethanol. White precipitate-silver chloride, Cream precipitate-Silver bromide, Yellow precipitate-Silver iodide
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What are the reagents and observations when testing for a carbonyl group?
Add 2,4-DNP (Brady's Reagent). A yellow or orange preccipitate will form if an aldehyde or ketone is present
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What are the obervations when Fehling's solution is added to an aldehyde?
The blue solution forms a dark red precipitate
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What are the obervations when Tollen's reagent is added to an aldehyde?
A silver mirror is produced
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What are the obervations when acidified potassium dichromate is added to an aldehyde?
The orange solution turns green
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What are the obervations when universal indicator or a pH probe is used on aliphatic carboxylic acids?
The pH is for a weak acid
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What are the obervations when a reactive metal(eg. Mg) or metal carbonate (eg.calcium carbonate) is reacted with an aliphatic carboxylic acids?
Effervescene
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What are the obervations when universal indicator or a pH prode is added to phenol?
pH for a weak acid
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What are the obervations when a carbonate is added to phenol?
There is no reaction so there is no effervescene
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What are the obervations and products when acidified potassium dichromate is added to a primary alcohol?
Colour change from orange to green as an aldehyde is formed and then a carboxylic acid
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What are the obervations and products when acidified potassium dichromate is added to a secondary alcohol?
They are oxidised to a ketone and the colour changes from orange to green
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What are the obervations and products when acidified potassium dichromate is added to a tertiary alcohol?
They cannot be oxidised so there is no obsservable colour change
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What are the observations and products when an alcohol is warmed with an equal volume of a carboxylic acid and a few drops of sulfuric acid?
Sweet smell of an ester after a short time
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Other cards in this set

Card 2

Front

What are the reagents and obervations when testing for haloalkanes?

Back

Add aqueous silver nirate and ethanol. White precipitate-silver chloride, Cream precipitate-Silver bromide, Yellow precipitate-Silver iodide

Card 3

Front

What are the reagents and observations when testing for a carbonyl group?

Back

Preview of the front of card 3

Card 4

Front

What are the obervations when Fehling's solution is added to an aldehyde?

Back

Preview of the front of card 4

Card 5

Front

What are the obervations when Tollen's reagent is added to an aldehyde?

Back

Preview of the front of card 5
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