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Correct reactivity order of alkyl halide...

Correct reactivity order of alkyl halides towards SN2 reaction is

A

`PhCOCH_2CL gt CH_2 = CHCH_2CL gt CH_3Cl gt CH_3CH(CI)CH_3`

B

`PhCOCH_2Cl gt CH_3Cl gt CH_2 = CHCH_2Cl gt CH_3CH(Cl)CH_3`

C

`CH_3Cl gt CH_2 = CHCH_2Cl gt CH_3CH(Cl)CH_3 gt PhCOCH_2Cl`

D

`CH_3Cl gt CH_2 = CHCH_2Cl gt PhCOCH_2Cl gt CH_3CH(Cl)CH_3`

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Nucleophilic substitution reactions are of two types, substitution nucleophllic bimolecular (SN^2) and substitution nucleophilic unimolecular (SN^1) depending on molecules taking part in determining the rate of reaction. Reactivity of alkyl halide towards SN^1 and SN^2 reactions depends on various factors such as steric hindrance, stability of intermediate or transition state and polarity of solvent. SN^2 reaction mechanism is favoured mostly by primary alkyl halide then secondary and then tertiary. This order is reversed in case of SN^1 reactions. SN^1 reaction is fastest in