Which of the following sequences of rates of alkaline hydrolysis of esters is correct?

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$\begin{array}{r} {CH}_{3} {CH}_{2} {COOCH}_{3} > {({CH}_{3})}_{2} {CHCOOCH}_{3} > {({CH}_{3})}_{3} {CCOOCH}_{3} \end{array}$

$\begin{array}{r} {CH}_{3} {CH}_{2} {COOCH}_{3} > {({CH}_{3})}_{2} {CHCOOCH}_{3} < {({CH}_{3})}_{3} {CCOOCH}_{3} \end{array}$

$\begin{aligned} {CH}_{3} {CH}_{2} {COOCH}_{3} < {({CH}_{3})}_{2} {CHCOOCH}_{3} < {({CH}_{3})}_{3} {CCOOCH}_{3} \end{aligned}$

${CH}_{3} {CH}_{2} {COOCH}_{3} < {({CH}_{3})}_{2} {CHCOOCH}_{3} > {({CH}_{3})}_{3} {CCOOCH}_{3}$

answer is B.

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Detailed Solution

Increasing crowdiness of R group in RCOOR' decreases the rate of alkaline hydrolysis of ester. Thus, the correct option is, $\begin{array}{r} {CH}_{3} {CH}_{2} {COOCH}_{3} > {({CH}_{3})}_{2} {CHCOOCH}_{3} > {({CH}_{3})}_{3} {CCOOCH}_{3} \end{array}$

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