Question

When phenol is treated with CHCl3 and alkali if give salicylaldehyde the intermediate
species of reaction-
फनिाओल को जब CHCI एवं क्षार के साथ क्रया कराते है तव सैलसिल्डहाइड बनता है अभकिया में अंतर
माध्यमकि समूह है।
a) Trichloro carbonium ion
b) Trichloro free radicoal
c) Trichloro carbanion
d) Carbene
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Answer 1

I think it would be (d) carbene

When phenol treated with chloroform in the presence of aqueous sodium hydroxide(base) at 340 K temperature followed by hydrolysis yields 2-hydroxybenzaldehyde also called as salicylaldehyde and reaction called as reimer-Tiemann reaction.

the reactions which involves carbene as intermediate are

*reimer-Tiemann

*Arndt-eister synthesis

*alkene inseration