R3.4 Electron-pair sharing reactions (SL)
14 revision questions with answers for R3.4 Electron-pair sharing reactions (SL). Read them here, or play the set as a class game on the projector. Free to host, and students join with a code.
Electron-pair donor that attacks an electron-deficient carbon?
- Electrophile
- Radical
- NucleophileRight answer
- Oxidising agent
What this set covers
Nucleophiles and electrophiles at SL: lone pair donors and acceptors, nucleophilic substitution in halogenoalkanes, leaving groups, and electrophilic addition of Br₂, HBr and steam to ethene, including the bromine water test.
- Common mix-up
- Students often mix up nucleophile and electrophile: nucleophiles donate a lone pair and are attracted to electron-poor carbon, while electrophiles accept a pair, which is why alkenes attract them.
- Revision tip
- Classify each species in the set as nucleophile or electrophile, then write the product and reaction type for 1-bromopropane with OH⁻ and for ethene with Br₂.
All 14 questions and answers
Electron-pair donor that attacks an electron-deficient carbon?
Answer: Nucleophile
Species that accepts a lone pair from a nucleophile?
Answer: Electrophile
Feature every nucleophile must have?
Answer: A lone pair
Which of these species is a nucleophile?
Answer: OH⁻
Which of these species is an electrophile?
Answer: H⁺
Organic product of warming 1-bromopropane with aqueous NaOH?
Answer: Propan-1-ol
Type of reaction between CH₃CH₂Br and aqueous OH⁻?
Answer: Nucleophilic substitution
The halide ion displaced from a halogenoalkane is called the…?
Answer: Leaving group
Alkenes attract electrophiles because the C=C bond has a high…?
Answer: Electron density
Type of reaction between ethene and bromine?
Answer: Electrophilic addition
Product of ethene with bromine?
Answer: 1,2-dibromoethane
Product of ethene with hydrogen bromide?
Answer: Bromoethane
Product of ethene with steam over a phosphoric acid catalyst?
Answer: Ethanol
Colour change when bromine water is shaken with an alkene?
Answer: Orange to colourless
Play it as a class game
Play this set opens it in splycr, where you can host it for your class straight away. Hosting needs no account: put the room code on the projector, and students join from a phone with the code and their first name. Each question plays as multiple choice, and the three wrong options were written for that question.