A-LevelChemistryHydrocarbonsMay/June 2023Paper 1 Q301 Mark
Alkynes are hydrocarbons that contain one triple C≡C bond. Like alkenes, alkynes take part in addition reactions. A saturated compound can be formed. For example, ethyne, H–C≡C–H, reacts with an excess of hydrogen to form ethane. Propyne, C₃H₄, undergoes an addition reaction with an excess of hydrogen bromide in two stages. Markovnikov's rule applies to the addition of HBr at each stage. What is the main product obtained when propyne reacts with an excess of hydrogen bromide?
ACH₂BrCH₂CH₂Br
BCH₃CH₂CHBr₂
CCH₃CHBrCH₂Br
DCH₃CBr₂CH₃
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The correct answer is D. This question tests the candidate's understanding of hydrocarbons within the Chemistrysyllabus. The examiner's mark scheme requires...
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