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  4. Leaving tendency of the following group in decreasing order is

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Q. Leaving tendency of the following group in decreasing order is
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Organic Chemistry – Some Basic Principles and Techniques

Solution:

As the negative. charge of leaving group can be delocalised into the phenyl ring and due to the $-I$ effect delocalization of negative charge will be more so the leaving group activity order is $IV > II > I > III$