Read the passage given below and answer the following questions:
Nucleophilic substitution reactions are of two types; substitution nucleophilic bimolecular (SN²) and substitution nucleophilic unimolecular (SN¹) depending on molecules taking part in determining the rate of reaction. Reactivity of alkyl halide towards SN¹ and SN² reactions depends on various factors such as steric hindrance, stability of intermediate or transition state and polarity of solvent. SN² reaction mechanism is favoured mostly by primary alkyl halide then secondary and then tertiary. This order is reversed in case of SN¹ reactions.
The most reactive nucleophile among the following is

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${CH}_{3} O^{-}$

$C_{6} H_{5} O^{-}$

${({CH}_{3})}_{2} {CHO}^{-}$

${({CH}_{3})}_{3} {CO}^{-}$

answer is A.

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Detailed Solution

Smaller the size of the nucleophile (i.e. ${CH}_{3} O^{-}$ ), more reactive it is.

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