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QLDChemistryQuick questions
Unit 4: Structure, synthesis and design
Quick questions on Reactions of alkanes and alkenes (QCE Chemistry Unit 4)
5short 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 reactions of alkanes?Show answer
Alkanes react with halogens (Cl2, Br2) in the presence of ultraviolet (UV) light or at high temperature. A hydrogen on the alkane is replaced by a halogen atom.
What is markovnikov's rule?Show answer
When HX adds to an unsymmetrical alkene, the H attaches to the carbon already carrying more hydrogens; X attaches to the carbon with fewer hydrogens (the more substituted carbon).
What is q1?Show answer
Write balanced equations for (a) complete combustion of propane, (b) free-radical bromination of methane. [3 marks]
What is q2?Show answer
Predict the major product when HBr adds to propene. Justify with Markovnikov's rule. [3 marks]
What is q3?Show answer
A student tests four colourless liquids with bromine water in light. (a) Pentane, (b) pent-1-ene, (c) cyclopentane, (d) cyclohexene. Predict observations and identify mechanism for each.
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