$C h o o s e i n c o r r e c t o p t i o n : -$

Reimer-Tiemann reaction of phenol yields salicylaldehyde.

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OH group in phenol is weakly deactivating towards electrophilic substitution reaction.

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Phenol undergoes Kolbe’s reaction to give o-hydroxy benzoic acid.

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OH group in phenol is ortho and para director.

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Solution

The correct option is B OH group in phenol is weakly deactivating towards electrophilic substitution reaction.

The presence of $- O H$ group in phenols strongly activates the aromatic ring towards electrophilic substitution and directs the incoming group to ortho and para positions due to resonance effect.

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