Chemistry · Alcohols, Phenols and Ether

When phenol reacts with concentrated nitric acid picric acid is formed.

This option is incorrect. Adipic acid is a dicarboxylic acid (HOOC-(CH₂)₄-COOH). It is not related to phenol or nitration reactions. Usually produced from cyclohexanol/cyclohexanone, not phenol.

This option is incorrect. This is a mono-nitration product where the –NO₂ group is added at the meta position. However, –OH group is an activating, ortho/para directing group, so nitration gives ortho and para products, not meta. m-Nitrophenol is formed only under specific, controlled mono-nitration conditions, not with concentrated HNO₃.

This option is correct. 2,4,6-Trinitrophenol is the major product when phenol reacts with concentrated nitric acid due to multiple substitutions. A bright yellow compound, historically used in explosives and dyes.

This option is incorrect. This is one of the products of mono-nitration of phenol using dilute nitric acid. It is not the main product when concentrated nitric acid is used.