Questions where students often pick the tempting wrong answer — make sure you know the right one:
How do alkenes typically react with bromine?✗ Bromine substitutes for a hydrogen on the alkene, releasing HBr.✓ By electrophilic addition — bromine adds across the double bond to form a dibromoalkane.
When water boils, what is broken?✗ The covalent bonds between hydrogen and oxygen atoms are broken when water boils.✓ Intermolecular forces (hydrogen bonds) between water molecules are broken — the O-H covalent bonds stay intact.
Why is cracking carried out in industry?✗ To make crude oil thicker✓ To turn long alkanes into useful short alkanes and alkenes
Why do long-chain alkanes have higher boiling points?✗ Stronger covalent bonds inside the molecule✓ Stronger intermolecular forces between molecules
Practise Organic Chemistry — free games
Test yourself with these quick revision games for this topic:
