04. Tests for aldehydes and ketones

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10 Terms

1
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What tests for aldehydes?

Tollens’ reagent and Fehlings solution

2
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What tests for Ketones?

Iodoform reaction

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What is tollens?

(Ag(NH3)2)+

4
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What is iodoform made of?

I2 / NaOH(aQ)

5
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Positive result of aldehydes and tollens?

Silver mirror

6
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Positive result of aldehydes in fehlings?

Brick red ppt (orange/yellow) of copper (I) oxide

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Positive reaction of ketones and iodoform?

Tests for methyl ketone group = yellow crystalline solid with anaesthetic smell

8
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General equation of tollens and aldehyde?

RCHO + 2Ag+(aq) + H2O -> RCOOH + 2Ag(s) + 2H+

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General equation of fehlings and aldehyde?

RCHO + 2Cu2+(aq) + 2H2O -> RCOOH + Cu2O(s) + 4H+(aq)

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General equation of iodoform?

CH3CH2OH + 4I2 +6NaOH -> CHI3 + HCOONa + 5NaI + 5H2O