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Alkanes are non-polar and relatively unreactive. However, they will undergo homolytic, free radical substitution with halogens.
i) Describe the reaction mechanism between propane (C3H8) and bromine (Br2) in the presence of UV light.
ii) Explain how the presence of the UV light allows this reaction to take place.
a) Represent the following using structural formula:
i) propan-1-ol ii) butan-2-ol iii) butan-1-ol
iv) ethanol v) pentan-3-ol vi) cyclohexanol
b) Below are the structures of three alcohols of molecular formula, C4H10O.
A B C
You will be given two samples of alcohol A which reacts with acidified potassium dichromate (K2Cr2O7/H+) under different conditions to produce two different products.
Include in your answer:
- Explain the conditions (techniques) you required to produce the different products
- The names and structures of the products produced
- Equations to summarise the reactions involved
c) Draw and name the structure of the product that would result from treating alcohol B with acidified potassium dichromate (K2Cr2O7/H+) and heating under reflux.
d) Using the same reagent, describe how you could distinguish between alcohols A or B and alcohol C.
e) Esters can be synthesised in the reaction between alcohols and carboxylic acids in a reaction called esterification.
Ethanol reacts with propanoic acid, name the product of the reaction with its structural formula