1.

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

Answer»

`-SO_(3)H`
`-COOH`
`-NO_(2)`
`-C=N`

Solution :Decreasing order of deactivating EFFECT of the given M-directing GROUP is
`-NO_(2)gt-CNgt-SO_(3)Hgt-COOH`
`-NO_(2)` group is most deactiveting group due to strong -E, -I and -M EFFECTS.


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