DP Chemistry (last assessment 2024)

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Question 19M.2.sl.TZ1.2a

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

Benzoic acid, C6H5COOH, is another derivative of benzene.

(a)

Draw the structure of the conjugate base of benzoic acid showing all the atoms and all the bonds.

[1]

Markscheme

 [✔]

 

Note: Accept Kekulé structures.

Negative sign must be shown in correct position- on the O or delocalised over the carboxylate.

Examiners report

Most failed to score a mark for the conjugate base of benzoic acid as either they didn’t show all bonds and atoms in the ring and/or they did not put the minus sign in the correct place. Some didn't read the question carefully so gave the structure of the acid form.

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