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Write a structural formula for the most stable cyclohexadienyl cation intermediate formed in each of the following reactions. Is this intermediate more or less stable

Write a structural formula for the most stable cyclohexadienyl cation intermediate formed in each of the following reactions. Is this intermediate more or less stable than the one formed by electrophilic attack on benzene?
(a) Bromination of p-xylene
(b) Chlorination of m-xylene
(c) Nitration of acetophenone
(d) Friedel–Crafts acylation of anisole with CH3CCI
(e) Nitration of isopropyl benzene
(f) Bromination of nitrobenzene
(g) Sulfonation of furan
(h) Bromination of pyridine

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