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Chemistry Tests > Organic Tests > Flashcards

Organic Tests Flashcards

1
Q

Alkene test?

A

Add bromine water dropwise

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2
Q

Alkene test - if a C=C is present?

A

The bromine water will decolourise rapidly from orange to colourless

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3
Q

Haloalkane test?

A

Add aqueous silver nitrate and ethanol, then warm to 50C

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4
Q

Haloalkane test - if chloroalkane present?

A

White precipitate formed. Dissolves on addition of dilute ammonia

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5
Q

Haloalkane test - if bromoalkane is present?

A

Cream precipitate formed. Dissolves on addition of concentrated ammonia

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6
Q

Haloalkane test - if iodoalkane is present?

A

Yellow precipitate formed. Insoluble on addition of both dilute and concentrated ammonia

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7
Q

Test for carbonyls?

A

Add 2,4-dinitrophenylhydrazine

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8
Q

Carbonyl test - if C=O is present?

A

Yellow/orange precipitate formed

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9
Q

What does 2,4-DNPH stand for?

A

2,4-dinitrophenylhydrazine

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10
Q

Test for aldehydes?

A

Add Tollens’ reagent and warm

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11
Q

Aldehyde test - if an aldehyde is present?

A

A silver mirror forms

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12
Q

Tollens’ reagent’s chemical name?

A

Ammoniacal silver nitrate ( [Ag(NH3)2]+ )

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13
Q

Test for alcohols?

A

Add acidified potassium dichromate and warm it in a water bath

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14
Q

Alcohol test - if a primary alcohol is present?

A

Colour change from orange solution to green solution

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15
Q

Alcohol test - if a secondary alcohol is present?

A

Colour change from orange solution to green solution

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16
Q

Alcohol test - if a tertiary alcohol is present?

A

No visible change from the orange solution

17
Q

Test for carboxylic acids?

A

Add aqueous sodium carbonate

18
Q

Carboxylic acid test - if a carboxylic acid is present?

A

Effervescence would occur

19
Q

Test for phenol?

A

Add bromine water dropwise

20
Q

Phenol test - if phenol is present?

A

The bromine water rapidly decolourises from orange to colourless, and a white precipitate is formed.

Chemistry Tests (3 decks)

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