Which of the following group is a weakly deactivating but o, p-directing group towards electrophilicsubstitution when attached to Benzene ring ?

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$- C l$

$- N O_{2}$

$- O C H_{3}$

$- C H_{3}$

answer is C.

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Detailed Solution

–Cl group shows -I and +M in choro benzene. It is a weakly deactivating group (-I > +M) towards ESR. It is an o, p-directing group towards electrophilic substitution reaction. Its reactivity is decided by -I effect. Its orientation is decided by +M effect.

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