DP Chemistry (last assessment 2024)

Question 20N.2.sl.TZ0.1d(ii)

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

d(ii).

[Maximum mark: 1]

20N.2.sl.TZ0.1d(ii)

Chlorine undergoes many reactions.

(d(ii))

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

This was a challenging question that was answered correctly by only 30% of the candidates. A variety of incorrect answers were seen such as 'chlorine is a halogen and hence it is reactive', and 'ethane is more reactive because it is an alkane'. For students who answered correctly, the polarity was the most frequently given reason.

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Core » Topic 10: Organic chemistry » 10.2 Functional group chemistry

Core » Topic 10: Organic chemistry

Question 20N.2.sl.TZ0.1d(ii)

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