Organic Qualitative AnalysisUnit 201

content by H Graham BSc PGCEhttp://goes.flexinet.com.au/default.htm

About Combustion All organic compounds contain carbon. All produce CO2 if burnt in air or O2. Steam is also produced. If the amount of O2 is limited CO main form instead of CO2.

ethanol burning

Flames can be luminous or non-luminous

Ethanol does not produce any soot or smoke

Benzene and other aromatic compounds can produce lots of soot! (and have luminous flames)

Why are they different?

About Combustion

ethanol burning

Why are they different? Calculate their

% C% C = mass of carbon/total mass x 100%

C2H5OH C6H6

Which of these would produce the greatest amount of soot burning?

a C8H18

b CH3CHO

c CH3COOC2H5

d C5H11OH

orange precipitatecarbonyl derivative of 2,4 -DNPH

+ propanone+ propanal

http://www.absoluteastronomy.com/topics/Fehling's_solution

Ketones do not react with Fehlings solution

This is usually called the silver mirror test! We will do this next week

+ Na

Na H2