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Q.

The order of reactivity for SN2 reaction, involving replacement of -X by a nucleophile in alkyl halide is 

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a

CH3>1∘<2∘

b

CH3<1∘>2∘

c

CH3<1∘<2∘

d

CH3>1∘>2∘

answer is B.

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Detailed Solution

  • Tertiary alkyl halides are the least reactive because, bulky groups hinder the approaching nucleophiles.
  • Of the simple alkyl halides, methyl halides react most rapidly in SN2 reactions
    because, there are only three small hydrogen atoms.
  • Thus, the order of reactivity followed is: Methyl halide > Primary halide > Secondary halide > Tertiary halide.
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