How many para substituted benzenoid isomers of C_(8)H_(8)O_(2) gives 1,4-dihydroxy benzene on hydrolysis ?

How many para substituted benzenoid isomers of C_(8)H_(8)O_(2) gives 1

1.	How many para substituted benzenoid isomers of C_(8)H_(8)O_(2) gives 1,4-dihydroxy benzene on hydrolysis ?
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