Which of the following alkyl halides can undergo both SN1 and SN2 mechanisms ?
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Answer: C. (CH3)2 CH – X
Explanation
Secondary alkyl halides can proceed via either SN1 or SN2 mechanisms easily. Reaction conditions like solvent polarity and nucleophile strength determine the pathway. Secondary carbocations are moderately stable allowing both unimolecular and bimolecular routes. Substitution mechanisms include bimolecular SN2 and unimolecular SN1 pathways. Primary halides favor SN2 while tertiary halides strictly favor SN1 pathways. Secondary substrates occupy an intermediate position in organic substitution reactivity.
Chemists control reaction pathways by carefully selecting solvents and nucleophile strengths. Understanding substitution mechanisms is essential for planning organic synthesis routes. Competitive side reactions often occur when secondary substrates are utilized. CH3-X is a primary methyl halide proceeding exclusively through the SN2 mechanism. (CH3)3 C-CH2 – X is sterically hindered and undergoes substitution with rearrangements. (CH3)3 C – X is a tertiary halide reacting strictly via the unimolecular SN1 pathway.
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