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प्रश्न
Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?
पर्याय
– COOH
– NO2
-C ≡ N
-SO3H
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उत्तर
– NO2
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\[\begin{array}{cc}
\phantom{..............................}\ce{CH3}\\
\phantom{...........................}|\\
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