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Choose the best explanation why vinyl and phenyl halides do not undergo \( \mathrm{S}_{\mathrm{N}} ...
Choose the best explanation why vinyl and phenyl halides do not undergo \( \mathrm{S}_{\mathrm{N}} 2 \) reactions: A vinyl chloride The back-side is inaccessible. The carbon is too electron-rich. The \( \pi \) bond changes the polarity of the C-X bond. Nucleophiles attack the \( \pi \) bond before halide displacement.