AQA A Level Chemistry Alkenes

What is the IUPAC name of the major product of the reaction between 2-ethylbut-1-ene and hydrogen bromide?

• 1-bromo-2-ethylbutane

• 2-bromo-2-ethylbutane

• 2-bromo-2-methylpentane

• 3-bromo-3-methylpentane

In which reaction does the inorganic reagent act initially as an electrophile?

• bromoethane with ethanolic potassium hydroxide

• chloroethane with aqueous sodium hydroxide

• ethane with chlorine

• ethene with concentrated sulfuric acid

What is the minimum volume of 0.0500 mol dm^–3 aqueous bromine needed to react completely with 0.0200 g of buta-1,3-diene?

(M_r of buta-1,3-diene = 54.0)

• 7.40 cm³

• 14.8 cm³

• 29.6 cm³

• 67.5 cm³

Which has E-Z isomers?

• C₂H₂Br₂

• C₂H₃Br

• C₂H₄Br₂

• C₂H₅Br

Which compound reacts with hydrogen bromide to give 2-bromo-3-methylbutane as the major product?

• (CH₃)₂C=CHCH₃

• CH₃(CH₂)₂CH=CH₂

• CH₃CH₂C(CH₃)=CH₂

• (CH₃)₂CHCH=CH₂

Which statement is not correct about CH₂═C(CH₃)CH₂Br?

• It displays E-Z isomerism.

• It forms an addition polymer.

• It reacts with electrophiles.

• It decolourises bromine water.

Which polymer has hydrogen bonding between its chains?

• Kevlar

• Polythene

• PVC

• Terylene

Which alkene reacts with hydrogen bromide to give 2-bromo-3-methylbutane as the major product?

• (CH₃)₂C=CHCH₃

• CH₃CH₂CH=CHCH₃

• CH₃CH₂C(CH₃)=CH₂

• (CH₃)₂CHCH=CH₂

Which statement is correct about poly(chloroethene)?

• It has the empirical formula CHCl

• It decolourises bromine water.

• Its brittleness is reduced by plasticisers.

• Its polymer chain contains alternate single and double bonds.

Consider the reaction between propene and hydrogen bromide to form the major product.

Which species is formed in the mechanism of this reaction?

• CH₃–C⁺H–CH₂Br

• CH₃–CHBr–C⁺H₂

• CH₃–C⁺H–CH₃

• CH₃–CH₂–C⁺H₂