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Question 18N.3.sl.TZ0.b

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Date November 2018 Marks available [Maximum mark: 1] Reference code 18N.3.sl.TZ0.b
Level sl Paper 3 Time zone TZ0
Command term Identify Question number b Adapted from N/A
b.
[Maximum mark: 1]
18N.3.sl.TZ0.b

Solar energy, which is freely available, is indispensable to life on earth.

Light can be absorbed by chlorophyll and other pigments.

Consider molecules A and B represented below.

Identify, with a reason, the molecule that absorbs visible light.

[1]

Markscheme

B AND larger/more extensive «electronic» conjugation

OR

B AND «contains» more alternate single and double bonds ✔

 

Accept more specific statements, such as “sp3 carbon in A prevents conjugation between aromatic rings”.

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