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Q.

The order of reactivity for S_N2 reaction, involving replacement of -X by a nucleophile in alkyl halide is

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a

${CH}_{3} > 1^{\circ} < 2^{\circ}$

b

${CH}_{3} < 1^{\circ} > 2^{\circ}$

c

${CH}_{3} < 1^{\circ} < 2^{\circ}$

d

${CH}_{3} > 1^{\circ} > 2^{\circ}$

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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