IB Chemistry SL Reactivity 3.4.5 Electrophilic Addition to Alkenes

Practise predicting addition products when an alkene reacts with water, a halogen or a hydrogen halide. Use the high electron density of the π bond to explain electrophilic…

Syllabus
First assessment 2025
Objective
3.4.5
Level
SL

Exam points

  • identify the electron-rich π bond as the region susceptible to electrophilic attack
  • replace the π component of C=C with two new single bonds to the added groups
  • deduce alkene addition products with correct connectivity and retained carbon skeleton

3.4.5—Electrophilic addition to alkenes question 1

[Maximum number: 3]

Alkenes, such as A (shown below), are important intermediates in the petrochemical industry because they undergo addition reactions to produce a wide variety of products, such as the conversion shown below.

Figure for Question 3.4.5—Electrophilic addition to alkenes question 1 — IB Chemistry SL

Question (a)

(a)

State the reagent required to convert A into B.

[ 1 ]

Question (b)

(b)

A can also be converted into C without going via B. State the reagent and conditions required.

[ 2 ]
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