A-Level H2 Chemistry 2

Question 1

What product is formed when ethene reacts with bromine water?

Accepted Answer

1,2-dibromoethane

Answer

Electrophilic addition: CH₂=CH₂ + Br₂ → CH₂Br-CH₂Br (1,2-dibromoethane). Bromine adds across the double bond.

Question 2

What is the IUPAC name of CH₃CH(OH)CH₂CH₃?

Accepted Answer

Butan-2-ol

Answer

The OH group is on carbon 2 of a 4-carbon chain (butane), so the compound is butan-2-ol.

Question 3

What type of reaction is the conversion of glucose to ethanol by yeast?

Accepted Answer

Fermentation (anaerobic)

Answer

Yeast converts glucose to ethanol and CO₂ under anaerobic conditions by fermentation: C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂.

Question 4

What does the term 'nucleophile' mean?

Accepted Answer

An electron pair donor that attacks electron-deficient centres

Answer

A nucleophile is an electron pair donor ('nucleus-loving') that attacks electron-deficient (δ+) carbon centres in reactions like nucleophilic substitution.

Question 5

What is the Brønsted-Lowry definition of an acid?

Accepted Answer

A proton donor

Answer

By the Brønsted-Lowry definition, an acid is a proton (H⁺) donor. This is broader than the Arrhenius definition and applies in non-aqueous systems.

GCE A-Level Practice Test

GCE A-Level Practice Test

A-Level H2 Chemistry 2