DP Chemistry (first assessment 2025)

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Question 19M.1A.SL.TZ1.33

Date	May 2019	Marks available	[Maximum mark: 1]	Reference code	19M.1A.SL.TZ1.33
Level	SL	Paper	1A	Time zone	TZ1
Command term		Question number	33	Adapted from	N/A

33.

[Maximum mark: 1]

19M.1A.SL.TZ1.33

Which is a major product of the electrophilic addition of hydrogen chloride to propene?

A. ClCH₂CH=CH₂

B. CH₃CH(Cl)CH₃

C. CH₃CH₂CH₂Cl

D. CH₃CH=CHCl

[1]

Markscheme

B

Examiners report

Markovnikov addition was handled much better by higher scoring candidates.

Syllabus sections

Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.4—Electron-pair sharing reactions » Reactivity 3.4.5—Alkenes are susceptible to electrophilic attack because of the high electron density of the carbon–carbon double bond. These reactions lead to electrophilic addition. Deduce equations for the reactions of alkenes with water, halogens, and hydrogen halides.