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IB Chemistry SL 3.4.5 Electrophilic Addition to Alkenes Questions

Use real SL exam questions to explain why an alkene π bond is attacked and to write or deduce products for water, halogen and hydrogen-halide additions.

Syllabus
First assessment 2025
Course
Chemistry SL
Level
SL

Exam points

  • Explain that the electron-rich π bond of an alkene is susceptible to electrophilic attack, including the bromine-water decolourisation test.
  • Write a balanced addition equation for an alkene with water, a halogen or a hydrogen halide, replacing C=C with two new bonds to the added groups.
  • Deduce the structural formula and connectivity of the alkene addition product from the alkene and reagent, including the major product for HX or hydration.

IB Chemistry SL 3.4.5 Electrophilic Addition to Alkenes Questions 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 IB Chemistry SL 3.4.5 Electrophilic Addition to Alkenes Questions 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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