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ChemistryJEE Main 21 Jan 2026, Shift 2·Q12·MCQ·Easy–moderate

Haloalkanes & Haloarenes · Nucleophilicity in SN2 reactions

The correct order of the rate of the reaction for the following reaction with respect to nucleophiles is:

CHX3Br+NuX⊖→CHX3Nu+BrX⊖\ce{CH3Br + Nu^{$\ominus$} -> CH3Nu + Br^{$\ominus$}}

  1. (1)PhOX−\ce{PhO^-} >> X−X22−OH\ce{^{-}OH} >> CHX3COOX−\ce{CH3COO^-} >> ClOX4X−\ce{ClO4^-}
  2. (2)ClOX4X−\ce{ClO4^-} >> CHX3COOX−\ce{CH3COO^-} >> X−X22−OH\ce{^{-}OH} >> PhOX−\ce{PhO^-}
  3. (3)CHX3COOX−\ce{CH3COO^-} >> PhOX−\ce{PhO^-} >> X−X22−OH\ce{^{-}OH} >> ClOX4X−\ce{ClO4^-}
  4. (4)X−X22−OH\ce{^{-}OH} >> PhOX−\ce{PhO^-} >> CHX3COOX−\ce{CH3COO^-} >> ClOX4X−\ce{ClO4^-}

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See the full 21 Jan 2026, Shift 2 paper