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Edexcel A-Level Chemistry AS 10.18 Potassium Dichromate Vi in Dilute Sulfuric Acid Can Oxidise I Primary Alcohols to Produce Aldehydes Which Give a Positive Questions

Practise Edexcel IAL Chemistry 10.18 by preparing aldehydes or carboxylic acids from primary alcohols, oxidising secondary alcohols to ketones and interpreting tests.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • oxidise primary alcohols to aldehydes by distilling the aldehyde as it forms
  • oxidise primary alcohols to carboxylic acids under reflux
  • oxidise secondary alcohols to ketones and recognise tertiary-alcohol resistance
  • use qualitative tests and stoichiometry to identify oxidation products

Edexcel A-Level Chemistry AS 10.18 Potassium Dichromate Vi in Dilute Sulfuric Acid Can Oxidise I Primary Alcohols to Produce Aldehydes Which Give a Positive Questions question 1

[Maximum number: 8]

Propan-1-ol, propan-2-ol and 2-methylpropan-2-ol are all alcohols commonly used in school laboratories.

Acidified potassium dichromate(VI) is used to oxidise alcohols.

Question (a)

(a)

State the colour change seen when an alcohol is oxidised with acidified potassium dichromate(VI).

[ 2 ]

Question (b)

(b)

An electric heater may be used to heat a sample of an alcohol with acidified potassium dichromate(VI).

[ 6 ]

Question (i)

(i)

State why there is no reaction when 2-methylpropan-2-ol is heated with acidified potassium dichromate(VI).

[ 1 ]

Question (ii)

(ii)

Identify, by name or formula, all the possible oxidation products of propan-1-ol and propan-2-ol.

[ 1 ]

Question (iii)

(iii)

Give a further chemical test and the positive result for each of the oxidation
products of propan-1-ol.

[ 4 ]
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