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SingaporeChemistryQuick questions
Organic Chemistry
Quick questions on Alkanes and free-radical substitution: Singapore A-Level H2 Chemistry
7short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is combustion?Show answer
Complete combustion (excess oxygen) gives carbon dioxide and water and releases much energy, which is why alkanes are fuels:
What is initiation?Show answer
UV light supplies the energy to break the halogen-halogen bond homolytically (each atom keeps one electron), generating two radicals:
What is propagation?Show answer
A radical reacts to form a product molecule and a new radical, sustaining a chain:
What is termination?Show answer
Two radicals combine, removing radicals and ending the chain:
What is q1?Show answer
Explain why alkanes are relatively unreactive. [2 marks]
What is q2?Show answer
Write the two propagation steps for the reaction of chlorine with ethane to form chloroethane. [2 marks]
What is q3?Show answer
Write a balanced equation for the complete combustion of butane. [1 mark]
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