(a)
Interpretation:
The aromatic compound for which nitration takes place faster is to be determined.
Concept introduction:
The most important resonance contributor is with a positive charge on the atoms having all actets fulfilled. The aromatic substitution takes place faster in the compound on which a positive charge is better stabilized.
(b)
Interpretation:
For each of the given compounds, at which C atom electrophilic aromatic substitution to predominantly take place is to be determined. The reason for it is to be explained.
Concept introduction:
Electrophilic aromatic substitution of pyrrole takes place primarily at the 2 position preferentially over the 3 position because the corresponding arenium ion intermediate has more resonance structures and so more stable.
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Chapter 23 Solutions
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