a level chemistry help! carbonyl compunds

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hotboi01
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#1
Report Thread starter 15 years ago
#1
hi, i was just wondering what the positive test for a carbonyl compound would be
thanks
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infekt
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#2
Report 15 years ago
#2
using 2 4 dinitrophenylhydrazine solution ... forms a yellow or orange precipitate with carbonyl compounds ...

i dont think with carboxylic acids though .... for tht u use sodium bicarbonate .... forms C02 gas
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magiccarpet
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#3
Report 15 years ago
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yea it forms a orange preciptiate only with ketones and aldehydes but not with carb acids because the coh bit causes some kind of dipole or something to the double bond

isnt a level chemistry all finished now?
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