Which of the following groups in electrophilic aromatic substitution ($\mathrm{EAS}$) reactions exhibit synergistic activation when present on a benzene ring?

Which is NOTa possible product of the reaction?

Which is NOT a possible product of the reaction?

Explain why fluorobenzene is more reactive than chlorobenzene toward electrophilic aromatic substitution but chloromethylbenzene is more reactive than fluoromethylbenzene.

Does m-xylene or p-xylene react more rapidly with Cl₂ + FeCl₃? Explain your answer.

For each of the following compounds, indicate the ring carbon(s) that is/are nitrated when the compound is treated with HNO₃/H₂SO₄:

a.

b.

For each of the following compounds, indicate the ring carbon(s) that is/are nitrated when the compound is treated with HNO₃/H₂SO₄:

c.

d.