Q.

Which of the following statements is correct?

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a

An electron-releasing group G in pGC6H4COOC2H5 decreases the rate of hydrolysis as compared to C6H5COOC2H5

b

The rate of alkaline hydrolysis of RCOOR' increases with the increase in the carbon atoms in the alkyl group R'.

c

The rate of alkaline hydrolysis of RCOOR' decreases with the increase in the branching of carbon skeleton of the alkyl group R.

d

The rate of alkaline hydrolysis of RCOOR' increases with the increase in the carbon atoms in the alkyl group R.

answer is A.

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Detailed Solution

(a) An electron-releasing group destabilises the intermediate carboxylate anion, hence decreases the rate of hydrolysis. 

(b) The steric effect and the electron-releasing effect of alkyl group decreases the rate of hydrolysis. 

(c) The steric effect will cause the decrease in the rate of hydrolysis.

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Which of the following statements is correct?