EduNinja

CAIE IGCSE Chemistry Bromination Hydrogenation and Hydration of Alkenes

CAIE IGCSE Chemistry Bromination Hydrogenation and Hydration of Alkenes
Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

Practise predicting alkene addition products with bromine, hydrogen or steam and drawing structures after replacing the carbon-carbon double bond.

How this is tested

  • add bromine across the double bond, draw the dibromoalkane and state orange to colourless
  • add hydrogen with a nickel catalyst to form the corresponding saturated alkane
  • add steam with an acid catalyst at stated conditions and draw possible alcohol products

Question 37

[Maximum number: 1]

Alkenes react with steam in an addition reaction.

Some alkenes produce only one alcohol product.
Some alkenes produce two different alcohols which are structural isomers.
Which row gives the number of alcohol isomers formed when ethene reacts with steam and when propene reacts with steam?

ethene + steam

propene + steam

1

1

1

2

2

1

2

2