Reaction of phenol with chloroform//sodium hydroxide to give `o-`hydroxy benzaldehyde onvolves the formation of

Reaction of phenol with chloroform // sodium hydroxide to give o- hydroxy benzaldehyde involves the formation of

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group ?

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduce which one of the following fuctional group?

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group?