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Question
Which among the following is the strongest o, p-directing group
Which among the following is the strongest o, p-directing group
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Solution
The correct option is A −OH
Activator - An atom or molecule capable of increasing electron density on benzene ring either by hyper conjugation or by mesomeric effect and +R effect.
Halogens are dectivator due -I effect so their reactivity is less than of benzene but Ortho-para directing is due to +R efftect and mesomeric effect.
Deactivaters decreases electron density on benzene ring so electrophile can attack on meta postion with difficulty.
Now the order
(o,p deactivator)−NO2<−CN<−SO3H<−COCH3<−COOH<−COOCH3<−COH
(o,p activator)−I<−Br<−Cl<−F<−H<−C6H5<CH3<−COCH3<−N(CH3)3−OH<−NH2
Activator - An atom or molecule capable of increasing electron density on benzene ring either by hyper conjugation or by mesomeric effect and +R effect.
Halogens are dectivator due -I effect so their reactivity is less than of benzene but Ortho-para directing is due to +R efftect and mesomeric effect.
Deactivaters decreases electron density on benzene ring so electrophile can attack on meta postion with difficulty.
Now the order
(o,p deactivator)−NO2<−CN<−SO3H<−COCH3<−COOH<−COOCH3<−COH
(o,p activator)−I<−Br<−Cl<−F<−H<−C6H5<CH3<−COCH3<−N(CH3)3−OH<−NH2
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