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Identify strongest electron withdrawing ...

Identify strongest electron withdrawing group among the given when attached to benzene ring ?

A

`-CO_(2) `

B

`- NO_(2)`

C

`-O-underset(O)underset(||)(C )- CH_(3) - CH_(3)`

D

`-underset(O)underset(||)(C ) -OCH_(3)`

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VMC MODULES ENGLISH-INTRODUCTION TO ORGANIC CHEMISTRY -level 1
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  2. What is the relationship between the following two structures ?

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