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(A) The reaction shown is an esterification reaction between an alcohol $(R-OH)$ and $p$-nitrobenzoic acid.In the mechanism of esterification,the alco

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$CH_3-$

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(A) The reaction shown is an esterification reaction between an alcohol $(R-OH)$ and $p$-nitrobenzoic acid.In the mechanism of esterification,the alcohol acts as a nucleophile and attacks the carbonyl carbon of the carboxylic acid.The rate of this reaction is primarily governed by steric hindrance.As the bulkiness of the alkyl group $R$ increases,the steric hindrance at the reaction center increases,which decreases the rate of nucleophilic attack.Therefore,the rate of reaction follows the order: $CH_3- > CH_3CH_2- > (CH_3)_2CH- > (CH_3)_3C-$.Thus,the fastest rate of reaction occurs when $R$ is $CH_3-$.

The fastest rate of reaction will be when $R$ is:

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