The reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional groups?

- C O O H

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- C H C l_{2}

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- C H O

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- C H_{2} C l

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Solution

The correct option is C $- C H O$
This is the wordy version of what is referred to as orthoformylation of phenol via a dichlorocarbene intermediate.
In popular parlance, this is the Reimer-Tiemann reaction.

Some of you might know that the mechanism proceeds through the introduction of $C H C l_{2}$ at
the ortho position but the problem statement says "finally introduces which one of... ".
Hence, the answer.

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