Phenyl ethanoate yields ortho and para hydroxy acetophenones. It involves migration of an acyl groyp from phenolic oxygen to ortho and para positions of the aromatic ring.
The intermediate substituted benzal chloride is hydrolysed in presence of alkali to produce salicylaldehyde.
Reimer Tiemenn reaction is an electrophilic substitution reaction. The first step is generation of electrophile.
Dichlorocarbene contains a sextet of electrons and thus is a strong electrophile.