DP Chemistry (last assessment 2024)

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Question 19M.2.sl.TZ1.c

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

Benzoic acid, C6H5COOH, is another derivative of benzene.

Suggest how benzoic acid, Mr = 122.13, forms an apparent dimer, Mr = 244.26, when dissolved in a non-polar solvent such as hexane.

[1]

Markscheme

«intermolecular» hydrogen bonding  [✔]

 

Note: Accept diagram showing hydrogen bonding.

Examiners report

Very few students answered this question correctly, thinking benzoic would bond with the hexane even though it was a non-polar solvent. It was very rare for a student to realize there was intermolecular hydrogen bonding.

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