DP Chemistry (last assessment 2024)

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Question 19M.2.hl.TZ1.2c

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.2.hl.TZ1.2c
Level hl Paper 2 Time zone TZ1
Command term Outline Question number c Adapted from N/A
c.
[Maximum mark: 1]
19M.2.hl.TZ1.2c

Benzoic acid, C6H5COOH, is another derivative of benzene.

(c)

Outline one piece of physical evidence for the structure of the benzene ring.

[1]

Markscheme

Any one of:

«regular» hexagon

OR

all «H–C–C/C-C-C» angles equal/120º [✔]
all C–C bond lengths equal/intermediate between double and single

OR

bond order 1.5 [✔]

Examiners report

Again less than half the candidates could accurately give a physical piece of evidence for the structure of benzene. Many missed the mark by not being specific, stating ‘all bonds in benzene with same length’ rather than ‘all C-C bonds in benzene have the same length’.

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