Alkenes (AQA A-Level Chemistry): Quizzes

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Electrophilic Addition Reactions
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What is an electrophile?

Accepts a pair of electrons

Why are alkenes reactive towards electrophiles?

C=CC=C bond has high electron density

Which is an example of an electrophile?

HBrHBr with δ+\delta+ H atom

What causes polarisation in Step 1 of electrophilic addition?

C=CC=C bond repels electrophile electrons

What intermediate forms when C=CC=C electrons attack an electrophile?

Carbocation

What is the product when ethene reacts with HBrHBr?

CH3−CH2BrCH_3-CH_2Br

What is the product when ethene reacts with H2SO4H_2SO_4?

CH3−CH2OSO3HCH_3-CH_2OSO_3H

What is the product when ethene reacts with Br2Br_2?

CH2Br−CH2BrCH_2Br-CH_2Br

What intermediate forms during Br2Br_2 addition to alkenes?

Cyclic bromonium ion

What is common to all electrophilic addition reactions of alkenes?

Carbocation then nucleophile attack

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