IB Chemistry SL Reactivity 3.3.2 Homolytic Bond Fission

Practise showing homolytic bond fission in which each atom receives one electron from the shared pair. Draw two single-barbed arrows, include radical dots in the products and…

Syllabus
First assessment 2025
Objective
3.3.2
Level
SL

Exam points

  • send one bonding electron to each atom using two single-barbed fish-hook arrows
  • show a radical dot on every product formed by homolytic cleavage of the bond
  • write halogen initiation under UV light or heat with atoms and coefficients balanced

3.3.2—Homolytic fission question 1

[Maximum number: 1]

Alkenes, such as A (shown below), are important intermediates in the petrochemical industry because they undergo addition reactions to produce a wide variety of products, such as the conversion shown below.

Figure for Question 3.3.2—Homolytic fission question 1 — IB Chemistry SL

Another way to make B is the reaction shown below.

Figure for Question 3.3.2—Homolytic fission question 1 — IB Chemistry SL

State the conditions required for this reaction to occur.

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