Which one of following compounds undergoes `EI` reaction most readily?

Which one of the following compounds undergoes hydrolysis most readily by aq. NaOH to furnish corresponding phenol ?

Which one of the following undergoes nitration reactions most readily?

Which one of the following undergoes decarboxylation most readily?

Which fo the following would undergo dehydration most readily?

Which one of the following aryl amine undergoes diazotisation most readily ?