Figure 1 Shown Below Is the Structure of Caffeine in the Centre

question 31

Multiple Choice

Figure 1
Shown below is the structure of caffeine in the centre and two different resonance states I and II with lone pairs and formal charges omitted.
-Referring to Figure 1,how many lone pairs of electrons can be found on the carbon atom at D?

• A)0
• B)1
• C)2

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