Increasing order of reactivity of the following compounds for S_N1 substitution is: (A) (CH3)2CH–CH2–Cl (B) CH3–CH2–CH2–Cl (C) p-OCH3–C6H4–CH2–Cl (D) C6H5–CH2–CH2–Cl

Question

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(B) < (C) < (D) < (A). The correct order reflects the stability of the carbocation intermediates formed during the S_N1 reaction. Primary alkyl halides (B) are the least reactive, while the presence of electron-donating groups like the methoxy group in (C) increases reactivity, and the tertiary structure in (A) leads to the most stable carbocation, making it the most reactive.

Increasing order of reactivity of the following compounds for S_N1 substitution is: (A) (CH3)2CH–CH2–Cl (B) CH3–CH2–CH2–Cl (C) p-OCH3–C6H4–CH2–Cl (D) C6H5–CH2–CH2–Cl

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