Consider the following acids 1 . M e C H 2 C O O H 2 . M e 2 C H C O O H 3 . M e 3 C C O O H 4 . E t 3 C C O O H Correct order of the rate of esterification of these acids with MeOH is

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The correct order of the rate of esterification of these acids with MeOH is 1 > 2 > 3 > 4.
The mechanism of esterification is

As the size of the substitution on $α$ -carbon increases, the tetrahedral bonded intermediate becomes more crowded. The greater the crowding, the slower is the reaction.

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