a) \( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br} \) is a primary alkyl halide, which is not favorable for SN1 reactions.
b) \( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHBr} \) is a secondary alkyl halide, which is more favorable
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