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IB Chemistry HL 3.4.5 Electrophilic Addition to Alkenes Questions

Use real HL exam questions to locate the electron-rich alkene π bond, write addition equations and deduce product connectivity for water, halogens and hydrogen halides.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Explain that the electron-rich π bond of an alkene is susceptible to electrophilic attack, including the bromine-water decolourisation test.
  • Write a balanced addition equation for an alkene with water, a halogen or a hydrogen halide, replacing C=C with two new bonds to the added groups.
  • Deduce the structural formula and connectivity of the alkene addition product from the alkene and reagent, including the major product for HX or hydration.

IB Chemistry HL 3.4.5 Electrophilic Addition to Alkenes Questions question 1

[Maximum number: 2]

Organic compounds have many industrial applications.

Question (a)

(a)

An alkene such as ethene can be used as starting material for a range of compounds.

[ 2 ]

Question (i)

(i)

Predict the product of the reaction between ethene and bromine.

[ 1 ]

Question (ii)

(ii)

Outline why unsaturated molecules, such as ethene, readily undergo this type of reaction.

[ 1 ]
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