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Topic 6: Organic Chemistry I - Introduction, Alkanes and Alkenes
Quick questions on Organic Chemistry I: Alkanes and Alkenes (Topic 6) - Edexcel A-Level Chemistry
4short 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 are alkane reactions?Show answer
Alkanes are saturated and fairly unreactive (strong, non-polar and bonds). They undergo: - Complete combustion to and in plenty of oxygen. - Incomplete combustion to (toxic) or soot when oxygen is limited. - Free-radical substitution with halogens in UV light, by a three-stage mechanism: initiation (homolytic bond fission of forming radicals), propagation (chain-carrying steps that regenerate a radical), and termination (two radicals combine to end the chain).
What are alkene reactions?Show answer
The double bond is electron-rich (a pi bond above and below the sigma bond) and attracts electrophiles, so alkenes undergo electrophilic addition with (the test for unsaturation, orange to colourless), , and (steam with a phosphoric acid catalyst, to make alcohols).
What is q1?Show answer
Name the three stages of the free-radical substitution mechanism. [3 marks]
What is q2?Show answer
Predict the major product of the reaction between propene and hydrogen bromide, and explain your choice. [3 marks]
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