MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

Crotonyl alcohol (2-buten-1-ol) has the structure CH _3- CH = CH - CH _2 OH , which contains only one - OH group. Ethylene glycol (ethane-1,2-diol) has the structure HO - CH _2- CH _2- OH , which contains two - OH groups. Pyrogallol (benzene-1,2,3-triol) contains three - OH groups attached to a benzene ring. Hydroquinone (benzene-1,4-diol) contains two - OH groups attached to a benzene ring. Therefore, crotonyl alcohol is the only compound among the given options that contains a single - OH group.