DP Chemistry (last assessment 2024)

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Question 21N.2.sl.TZ0.4a(iii)

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Date November 2021 Marks available [Maximum mark: 2] Reference code 21N.2.sl.TZ0.4a(iii)
Level sl Paper 2 Time zone TZ0
Command term Justify, Suggest Question number a(iii) Adapted from N/A
a(iii).
[Maximum mark: 2]
21N.2.sl.TZ0.4a(iii)

1-chloropentane reacts with aqueous sodium hydroxide.

(a(iii))

Suggest, with a reason, why 1-iodopentane reacts faster than 1-chloropentane under the same conditions. Use section 11 of the data booklet for consistency.

[2]

Markscheme

bond enthalpy C–I lower than C–Cl
OR
C–I bond weaker than C–Cl ✔


«weaker bond» broken more easily/with less energy
OR
lower Ea «for weaker bonds» ✔


Accept the bond enthalpy values for C–I and C–Cl for M1.

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