S_N2 Reaction: Allyl Chloride with HS ^–

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The π framework of p orbitals provides stabilisation in the transition state. This improves the rate of the S_N2 reaction and also causes the S_N2 reaction to be favoured over S_N1.

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Alternatively, use these links: (Substrate: Nucleophile)

Allyl chloride : SH | Benzyl chloride : SH | 2^o benzyl chloride: SH | 2^o allyl chloride : SH (S_N2′)

R. H. DeWolfe and W. G. Young, Chem. Rev., 1956, 56, 753–901.

J. W. Hill and A. Fry, J. Am. Chem. Soc., 1962, 84, 2763–2769.