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In the reaction is: Thyoxine is:...

In the reaction is:

Thyoxine is:

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The correct Answer is:
`b`
`SE` reaction takes place ortho to `(-OH)` group not ortho to `(-underset(..)overset(..)(O)-)` group. Since it is deactivated by the strong `oveline(e)` withdrawing group (`-COO^(o-)` and `overset(o+)(N)H_(3)`) in another ring.
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