DP Chemistry (last assessment 2024)

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Question 22N.1.sl.TZ0.13

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1.sl.TZ0.13
Level sl Paper 1 Time zone TZ0
Command term Determine Question number 13 Adapted from N/A
13.
[Maximum mark: 1]
22N.1.sl.TZ0.13

Chlorofluorocarbons (CFCs) contain bonds of the following lengths:

C—C = 1.54 × 10−10 m

C—F = 1.38 × 10−10 m

C—Cl = 1.77 × 10−10 m

What is the order of increasing bond strength in the CFC molecule?

 

A.   C—C  <  C—F  <  C—Cl

B.   C—C  <  C—Cl <  C—F

C.   C—Cl <  C—C  <  C—F

D.   C—F  <  C—C  <  C—Cl

[1]

Markscheme

C

Examiners report

63% of the candidates were able to deduce the order of increasing bond strength from the bond lengths. The most commonly chosen distractor was D which had the reverse order. The question discriminated well between high-scoring and low-scoring candidates.

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