4.2 (alcohols, haloalkanes, analysis)

Tali Skipper
Mind Map by Tali Skipper, updated more than 1 year ago
Tali Skipper
Created by Tali Skipper about 4 years ago


A-Level Chemistry (4.2) Mind Map on 4.2 (alcohols, haloalkanes, analysis), created by Tali Skipper on 26/02/2016.

Resource summary

4.2 (alcohols, haloalkanes, analysis)
1 Haloalkanes
1.1 Primary Haloalkane
1.1.1 Halogen at the end
1.2 Reactivity
1.2.1 Atoms get bigger down the group Strong sheilding Lower mean bond enthalpies So more reactive down the group
1.2.2 Electronegativity decreases down the group C-H bonds are polar Highest polarity more likely to react Polarity decreases down
1.3 Nucleophilic Substitution
1.3.1 Atom/ group of atoms exchanged for a nucleophile Nucleophile electron-pair donor Attracted to δ+ C
1.3.2 Hydrolysis Reacting species = H₂O or -OH ion Rate Bond enthalpy is the most important Least polar = Fastest rate Faster with aq alkali C-X bond undergoes heterolytic fission to produce halide ion Halide ions form a coloured precipitate when acidic silver nitrate is added
1.4 Environment
1.4.1 CFCs Don't react Non-toxic Fridges, making plastic, fire-extinguishers Become exposed to UV Homolytic fission creates Cl radicals These catalyse the decomposition of O₃ to O₂
1.4.2 Ozone layer protects from UV-B/C radiation Problematic hole in O₃ layer
2 Analysis
2.1 Quickfit apparatus
2.1.1 Grease joints slightly
2.1.2 Water at the bottom of condnser
2.2 Purifying an organic liquid
2.2.1 Redistillation Distillate is distilled to make really pure
2.2.2 Separating funnel Organic layer is less dense than water So can be romoved Pour liquid through funnel. Swirl vessel with water and add to funnel Equalise pressure remove water and collect organic layer
2.2.3 Drying agents Inorganic salts remove water Use gravity filtration to collect the organic product
2.3 Functional group tests
2.3.1 Unsaturated Hydrocarbon Bromine water decolourises
2.3.2 Haloalkane AgNO₃, C₂H₆O, H₂O White precip = Chloro Cream precip = Bromo Yellow precip = Iodo
2.3.3 Carbonyl Acidified K ₂Cr₂O₇ Ketones = no Aldehyde = Orange - Green Fehling's aldehyde = dark red precip Tollens' Ketones = no silver mirror
2.3.4 Carboxylic acid Universal indicator Weak acid pH Reactive metal/ metal carbonate effervescence Hydrogen CO₂
2.3.5 Alcohol Carboxylic acid, H₂SO₄ Smell of ester
2.4 Spectroscopy
2.4.1 Mass Spectroscopy
2.4.2 Infrared Spectroscopy
3 Alcohols


3.1 Properties of alcohols
3.1.1 Structure Primary Secondary Tertiary
3.1.2 Boiling Point Increases as chain length increases More SA contact Stronger London forces Strong hydrogen bonds
3.1.3 Evaporation Volatility increases as boiling point decreases
3.1.4 Solubility Polar -OH Chain length increases Solubility decrease
3.2 Reactions of Alcohols
3.2.1 Oxidation Primary Aldehyde Carboxylic acid Secondary Ketone Tertiary No Reaction
3.2.2 Esterification -COOR Esters used in foods and as solvents React carboxylic acid with an alcohol Concentrated H₂SO₄ and 80'C hot water bath speed reaction Continually distilled Mainly insoluble in water Visible oily layer
3.2.3 Dehydration Elimination of H₂O Strong acid, 170'C, Ruflux π-bond forms
3.2.4 Halide Substitution ROH+HX-->RX+H₂O Acid catalyst H₂SO₄, mixture warmed H₃PO₄ used for iodide
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