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

question 48

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,what is the formal charge of the oxygen atom at B?

• A)+1
• B)0
• C)-1
• D)-2

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