Which of the following nucleophile will show minimum reactivity towards $S_{N} 2$ reaction?

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${Me}_{2} {CHO}^{-}$

${MeO}^{-}$

${Me}_{3} {CO}^{-}$

answer is A.

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Detailed Solution

The nucleophile ${Me}_{3} {CO}^{⊝}$ will show minimum reactivity towards SN² reaction. This is due to the presence of bulky tert butyl group which prevents the attack of the nucleophile on the substrate due to steric hindrance.

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