Test for Organic Functional Groups Flashcards

1
Q

how do we test for an alkene?

A
  • add bromine water an dmix
  • bromine water turns from orange to colourless
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2
Q

how do we test for haloalkanes?

A
  • add silver nitrate and ethanol and warm
  • predicate of AgX forms and the colour of this ppt tells us what halogen is present
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3
Q

how do we test for an alcohol?

A
  • add acidified dichromate and heat
  • colour change from orange to green
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4
Q

how do we test for an aldehyde?

A
  • add Tollens’ reagent and warm
  • silver mirror forms
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5
Q

how do we test for carbonyl compounds?

A
  • add 2.4-dinitrophenylhydrazine
  • orange precipitate forms
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6
Q

how do we test for carboxylic acids?

A
  • add NaHCO3
  • effervescence
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7
Q

how do we test for phenols?

A
  • it’s a weak acid
  • phenol does not react with CO3(2-)
  • such as sodium carbonates
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