Question

Amongst the three isomers of nitrophenol, the one that is least soluble in water is:

• A. ortho
• B. meta
• C. para
• D. none of these

Answer 1

The correct option is A ortho

$o-nitrophenol$ behaves differently with regards to solubility in water due to intramolecular hydrogen bonding. The nitro and phenolic group are so close to each other that they form a hydrogen bond. It eliminates the chance of hydrogen bonding between water and $o-nitrophenol$, making it insoluble in water.