Which of the following substituent groups represents +R effect?
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Cyanide group has a positive group i.e. C directly attached to the benzene ring. Therefore, it will show –R resonance effect. Cyanide group has a positive group i.e. C directly attached to the benzene ring. Therefore, it will show –R resonance effect. Positive resonance- it is shown by the substituents and groups which release electrons to the rest of the molecules by delocalization and it is denoted by +R.
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