CourseCourseConceptConceptDocumentDocument

CAIE A-Level Chemistry AS 14.2.1 Preparation of Alkenes Questions

Practise preparing alkenes by eliminating HX from halogenoalkanes, dehydrating alcohols with heated catalysts or acids, and cracking longer-chain alkanes in CAIE 9701 questions.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • prepare an alkene by eliminating HX from a halogenoalkane with ethanolic NaOH and heat
  • prepare an alkene by dehydrating an alcohol with hot Al2O3 or concentrated acid and heat
  • prepare alkenes by cracking a longer-chain alkane and balance the resulting alkane and alkene products

CAIE A-Level Chemistry AS 14.2.1 Preparation of Alkenes Questions question 1

[Maximum number: 1]

When heated with KOH dissolved in ethanol, halogenoalkanes can undergo an elimination reaction to form alkenes.

What are the possible elimination products when 2-bromobutane is heated with KOH dissolved in ethanol?

A

CH3CH=CHCH3\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCH}_{3} only

B

CH3CH2CH=CH2\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CH}_{2} only

C

CH3CH=CHCH3\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCH}_{3} and CH3CH2CH=CH2\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CH}_{2}

D

CH3CH=CHCH3\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCH}_{3} and CH2=CHCH=CH2\mathrm{CH}_{2}=\mathrm{CHCH}=\mathrm{CH}_{2}

All question bank results loaded