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10.2 FUNCTIONAL GROUP CHEMISTRY (alcohol (oxidation (primary (aldehyde…
10.2 FUNCTIONAL GROUP CHEMISTRY
alcohol
produce by
hydration of alkene
100% atom economy
fast
higher yield
purer product
fermentation
renewable
low energy
combustion
complete
oxygen
water
oxidation
primary
aldehyde
distillation
partial oxidation
excess alcohol
carboxylic acid
reflux
full oxidation
excess oxidizing agent
secondary
ketone
tertiary
resist oxidation
lack of Hydrogen
oxidizing agents
Kr2Cr2O7
orange to green
KMnO4
purple to colourless
condensation with carboxylic acid
esterification
heated in presence of catalyst (sulphuric acid)
alkenes
unsaturated hydrocarbons that contains at least one C=C bond
test for unsaturation
addition of bromine water and mixture of alkene and bromine water will change colour from brown to colourless
C2H4 (g) + Br2 (g) → C2H4Br2 (aq) [brown→colourless]
addition reaction
hydrogenation
catalyst - nickel
temperature - 150°C
react with hydrogen gas and form saturated alkane
halogenation
addition of elemental halogen
react with steam
catalyst - phosphoric (V) acid
temperature - 300°C
pressure - 6-7MPa
polymerization
linking together many small monomers to form a polymer
the C=C replaced by a single C-C bond, and the electrons released forming new bonds to the adjacent monomers
alkanes
substitution reactions
initiation (1)
presence of UV light
homolytic fission
Cl2 → 2Cl·
propagation (2)
Cl· + CH4 → CH3· + HCl (1)
CH3· + Cl2 → CH3Cl + Cl· (2)
CH3Cl + Cl· → CH3Cl· + HCl (3)
CH2Cl· + Cl2 → CH2CL2 + Cl· (4)
termination (3)
Cl· + Cl· → Cl2 (1)
CH3· + Cl· → CH3Cl (2)
CH3· + CH3· → C2H6 (3)
remove free radicals
combustion
incomplete
CO2 and H2O
C and H2O
very limited O2
highly exothermic
large amount of E released in forming C=C
complete
CO2
H2O