Q.Which one of the following will react with phenol to give salicylaldehyde after hydrolysis?

Step 1. Salicylaldehyde (2-hydroxybenzaldehyde) is made from phenol by the RIEMER-TIEMANN REACTION.

Step 2. This reaction's reagent is chloroform (CHCl3, trichloromethane) with aqueous NaOH, which generates dichlorocarbene in situ; the phenoxide ring attacks this carbene at the ortho position, and the resulting dichloromethyl intermediate is hydrolysed on further treatment with NaOH. …

Identify the Riemer-Tiemann reaction by its product (an ortho -CHO on phenol) and recall …

• Confusing trichloromethane (chloroform, CHCl3, one carbon) with trichloroethane (a two-carbon compound) -- only the ONE-carbon t …