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As per your syllabus, which substituent shows a -R (negative resonance) effect?
A-OH
B-NH₂
C-OR
D-NO₂
Answer & Solution
Correct answer: D. -NO₂
Your syllabus: -NO₂, -COOH, -CHO, >C=O, -CN are -R. -NH₂, -OH, -OR, halogen are +R.
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