Chemistry · Organic Chemistry
निम्नलिखित कार्यात्मक समूहों में से कितने सुगंधित इलेक्ट्रॉनोंरागी प्रतिस्थापन (electrophilic substitution) अभिक्रिया में ऑर्थो/पैरा-निर्देशी (ortho/para-directing) हैं? -C2H5, -OH, -CHO, -CN, -OCH3, -COOH, -Cl, -NH2
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