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Question:

SN2 reaction readily occurs in: CH3CH2−O−CH3, CH3−CH3|C−|CH3O−CH3, CH2=CH−CH2−O−CH3, Ph−CH2−O−CH2−CH3

CH3CH2−O−CH3

CH3−CH3|C−|CH3O−CH3

CH2=CH−CH2−O−CH3

Ph−CH2−O−CH2−CH3

Solution:

SN2 reactions occur more readily at carbons that are less substituted. It is easier for the nucleophile to attack if there is little substitution around the C-leaving group bond. Therefore, the order of reactivity for alkyl halides is methyl>primary>secondary>>>tertiary.