The compound that will react most readily with NaOH to form...

The compound that will react most readily with NaOH to form methanol is
(a) $\left(\mathrm{CH}_3\right)_4 \mathrm{~N}^{+} \mathrm{I}^{-}$
(b) $\mathrm{CH}_3 \mathrm{OCH}_3$
(c) $\left(\mathrm{CH}_3\right)_3 \mathrm{~S}^{+} \mathrm{I}^{-}$
(d) $\left(\mathrm{CH}_3\right)_3 \mathrm{CCl}$

Key Concepts

Substrate Structure and Steric Effects

The structure of the substrate, particularly the degree of steric hindrance around the electrophilic center, plays a crucial role in nucleophilic substitution reactions. Methyl groups, being minimally hindered, are highly susceptible to attack by nucleophiles like hydroxide, whereas more sterically encumbered centers react slower. This understanding helps in predicting which compounds will react most readily in substitution reactions to yield products such as methanol.

SN2 Reactions

SN2 reactions involve a nucleophile approaching an electrophilic center and displacing a leaving group in a single, concerted step. This mechanism is sensitive to steric hindrance, with primary and methyl centers reacting most rapidly, and is central to understanding how hydroxide ion can attack a methyl group attached to a positively charged atom in order to form an alcohol like methanol.

Nucleophilic Demethylation

Nucleophilic demethylation is a process in which a nucleophile, such as hydroxide ion, attacks a methyl group that is attached to a positively charged heteroatom (e.g., sulfur or nitrogen). This leads to the removal of a methyl group as methanol while converting the parent cation into a lower alkylated species. This concept is crucial in identifying electrophilic centers that are predisposed for attack by nucleophiles.

Leaving Group Ability

The facility with which a group departs from a molecule during a substitution reaction is its leaving group ability. In demethylation reactions, the departure of a neutral amine or sulfide can drive the formation of a new bond, such as the oxygen–methyl bond in methanol. A better leaving group makes the corresponding substrate react more readily under SN2 conditions.

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