Complete each of the following reactions by giving the principal organic product(s). For (b), write a curved-arrow mechanism that shows the arenium ion intermediate and its resonance structures.

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(a) (c) Br + HNO3 CH=0 acetic acid O -&-ph + H₂C-C-Ph NaOH (b) (d) CH3 + H₂C CH3 of + N-Br -0-C-CH3 light CCl4 BF₁ acetic acid