Structure and electrophilic addition reactions of alkenesAQA A-Level Chemistry: Mind map

Exam questions on Structure and electrophilic addition reactions of alkenes

1. Propene, CH₃CH=CH₂, is an unsaturated hydrocarbon. A student shakes a sample of propene gas with bromine water, and in a separate experiment reacts propene with bromine in an inert solvent.
   Write an equation for the reaction of propene with bromine, using structural formulae, and name the organic product.2 marks
2. Carbocations are intermediates in electrophilic addition reactions of alkenes. They are classified as primary, secondary or tertiary according to the number of alkyl groups attached to the positively charged carbon atom.
   Explain why a tertiary carbocation is more stable than a primary carbocation.2 marks
3. Alkenes react with electrophiles such as bromine and concentrated sulfuric acid. A student is asked to describe the mechanisms of these reactions using ethene as the example.
   Describe the mechanism for the reaction of ethene with bromine, referring to the movement of electron pairs.3 marks