CourseCourseConceptConceptDocsDocuments

CAIE A-Level Chemistry AS 14.2.3 Of Aq Bromine to Show the Presence of a C C Questions

Practise the CAIE 9701 bromine-water test: reagent conditions, decolourisation observations and what they show about C=C bonds.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • use aqueous bromine at room temperature to test for alkene unsaturation
  • identify decolourisation of orange/brown bromine water to colourless as addition across C=C
  • distinguish an alkene from an alkane using the bromine-water observation and explain its limitation

CAIE A-Level Chemistry AS 14.2.3 Of Aq Bromine to Show the Presence of a C C Questions question 1

[Maximum number: 2]

4P⃗,Q4 \vec{P}, Q and R all have the molecular formula C3H6O\mathrm{C}_{3} \mathrm{H}_{6} \mathrm{O}. They are all structural isomers of each other.
P and Q each contain an oxygen atom bonded directly to a carbon atom that is sp2\mathrm{sp}^{2} hybridised. R contains an oxygen atom bonded directly to a carbon atom that is sp3\mathrm{sp}^{3} hybridised.

R contains two different functional groups, one of which is an alkene group. R reacts with cold, dilute, acidified manganate(VII) ions to form propane-1,2,3-triol.

propane-1,2,3-triol

propane-1,2,3-triol

State the type of reaction and what you would observe when R reacts with bromine water.

All question bank results loaded