The Reimer-Tiemann reaction involves treating phenol with chloroform in the presence of sodium hydroxide, resulting in the introduction of a -CHO group at the ortho position of the benzene ring. The intermediate benzal chloride is hydrolyzed to produce salicylaldehyde.

Methanol is mainly produced through the catalytic hydrogenation of carbon monoxide, utilizing a ZnO – Cr₂O₃ catalyst. It is used as a solvent in paints, varnishes, and predominantly in the production of formaldehyde.

Phenoxide ion, produced by treating phenol with sodium hydroxide, undergoes electrophilic substitution with carbon dioxide in Kolbe’s reaction, forming ortho hydroxybenzoic acid as the main product. The phenoxide ion is more reactive than phenol due to its enhanced nucleophilicity.

Phenol forms 2,4,6-tribromophenol as a white precipitate when treated with bromine water. This occurs under typical conditions, such as room temperature, favoring the formation of the tribromophenol product.

The -OH group in phenol activates the benzene ring, allowing halogenation to occur at low temperatures in solvents like CHCl₃ or CS₂, forming monobromophenols. Phenol’s high reactivity is attributed to the activating effect of the -OH group, eliminating the need ...