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IB Chemistry HL 3.3.2 Homolytic Fission Question Bank

Practise IB Chemistry HL 3.3.2 Homolytic Fission with focused questions on electron movement, radical steps and reaction products.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

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]

Nitrous acid, HNO2\mathrm{HNO}_{2}, is a weak acid which can be used to make acidic buffers.

Ethyl ethanoate can be produced by the reaction of ethanol with ethanoic acid. Both reactants can be synthesized from ethane through a series of reactions, the first of which is shown.

C2H6( g)+Cl2( g)→C2H5Cl( g)+HCl( g)\mathrm{C}_{2} \mathrm{H}_{6}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g}) \rightarrow \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{Cl}(\mathrm{~g})+\mathrm{HCl}(\mathrm{~g})

The first step in this reaction, initiation, is given by the following equation.

Cl2→2Cl⋅\mathrm{Cl}_{2} \rightarrow 2 \mathrm{Cl} \cdot

State an essential condition for this reaction.

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