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Edexcel IAL Chemistry 10.16 Primary, secondary and tertiary alcohols

Locate the carbon bearing OH and count its direct carbon neighbours; use no dichromate colour change only as supporting evidence for a tertiary alcohol.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Define primary, secondary or tertiary from carbon neighbours of the OH-bearing carbon.
  • Select, name or draw alcohol isomers matching a specified structural class.
  • Use resistance to acidified dichromate oxidation to identify a tertiary alcohol.

10.18—Potassium dichromate(VI) in dilute sulfuric acid can oxidise: i primary alcohols to produce aldehydes (which give a positive 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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