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CAIE A-Level Chemistry AS 13.4.5 Chiral Centres and Geometrical Cis Trans Questions

Practise identifying chiral centres and cis/trans geometry in open-chain and cyclic structural formulae, then counting or drawing the stereoisomers required by CAIE 9701 questions.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • identify chiral centres by checking whether a tetrahedral atom is bonded to four different groups, including in cyclic structures
  • identify cis/trans isomerism by locating a restricted C=C bond or suitable ring arrangement and checking the groups attached
  • analyse a given structural formula to distinguish chiral centres and geometrical isomerism, then count or draw the resulting stereoisomers

CAIE A-Level Chemistry AS 13.4.5 Chiral Centres and Geometrical Cis Trans Questions question 1

[Maximum number: 1]

When 1-methylcyclohexene reacts with Br2\mathrm{Br}_{2} the product is X .
When 1-methylcyclohexene reacts with HBr the major product is Y .

Figure for Question CAIE A-Level Chemistry AS 13.4.5 Chiral Centres and Geometrical Cis Trans Questions question 1 — CAIE A-Level Chemistry AS

Which statement is correct?

A

X is a mixture of two stereoisomers; Y does not have stereoisomers.

B

X is a mixture of two stereoisomers; Y is a mixture of four stereoisomers.

C

X is a mixture of four stereoisomers; Y does not have stereoisomers.

D

X is a mixture of four stereoisomers; Y is a mixture of four stereoisomers.

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