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Homework 2.3
Date due ..........................................
Chapter 3 - Alcohols
1.
The dehydration of butan-2-ol can form two different isomers of butene.
(a)
Draw a diagram of the apparatus you could use in the laboratory to bring
about the dehydration of butan-2-ol. Name any chemicals used.
(b)
What is meant by the term ‘dehydration’? …………………………………………………………………….
(c)
Draw and name the structures of the two butene isomers formed.
………………………………………………………
(d)
………………………………………………………….
An isomer of butan-2-ol gives only one product on dehydration. Name this
isomer.
………………………………………………………………………………………………………………………………………..
2.
Draw the structural formulae for each of the following alcohols and state
whether the alcohol is a primary, secondary or tertiary alcohol.
(a) Pentan-3-ol.
……………………………………
(b) 2-methylbutan-1-ol
(c) 3-ethylpentan-3-ol.
………………………………………….
………………………………………..
3.
Ethanol can be produced commercially by fermentation of glucose.
(a)
Name the enzyme present in yeast which catalyses the reaction. ……………………………
(b)
Name the gas which is produced in the reaction.
(c)
Another industrial process used to manufacture ethanol involves the addition of
water to ethene using a catalyst.
……………………………..
(i)
Why are methods other than fermentation needed for manufacturing
ethanol?
……………………………………………………………………………………………………………………………………….
(ii)
What name is given to the industrial process described?
………………………………………………………………………………………………………………………………………..
4.
Burning is an oxidation process.
(a)
What are the products formed by the complete combustion of an alcohol?
……………………………………………………
(b)
and
…………………………………………………………
Acidified potassium dichromate can be used to oxidise some alcohols.
(i)
Which types of alcohols (primary, secondary or tertiary) can be oxidised
using acidified potassium dichromate?
…………………………………………………………………………………………………………………………
(ii)
What colour change would indicate that a reaction had taken place?
…………………………………………………………………………………………………………………………
(iii)
Name another reagent that could be used to oxidise alcohols.
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