Question Topics: Reactivity 3.4 Electron-pair sharing reactions

Which of these ions would be a suitable species to react with benzene in a substitution reaction?

Which species is an intermediate in the following reaction mechanism? Step 1: \( (CH_3)_3CBr \rightarrow (CH_3)_3C^+ + Br^- \) Step

Which species would take part in a substitution reaction with benzene?

Which correctly describes the heterolytic bond fission of a bromine molecule (\( Br_2 \))?

What is the role of the \( CN^- \) ion in the reaction of 1-chloropropane with excess KCN in ethanol?

What is the main product of the reaction between but-1-ene, \( CH_{2}CHCH_{2}CH_{3} \) and hydrogen bromide, HBr?

Which statement is correct about an $S_{N}2$ mechanism?

But-2-ene undergoes a variety of addition reactions. Which of the following is correct?