DP Chemistry (last assessment 2024)

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Question 20N.2.hl.TZ0.d(ii)

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.2.hl.TZ0.d(ii)
Level hl Paper 2 Time zone TZ0
Command term Justify, Predict Question number d(ii) Adapted from N/A
d(ii).
[Maximum mark: 1]
20N.2.hl.TZ0.d(ii)

Chlorine undergoes many reactions.

Predict, giving a reason, whether ethane or chloroethane is more reactive.

[1]

Markscheme

chloroethane AND C–Cl bond is weaker/324 kJ mol−1 than C–H bond/414 kJ mol−1
OR
chloroethane AND contains a polar bond ✔


Accept “chloroethane AND polar”.

Examiners report

The underlying reasons for the relative reactivity of ethane and chloroethane were not very well known with a few giving erroneous reasons and some stating ethane more reactive.

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