MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

Bromine water test is used to detect the presence of unsaturation (double or triple bonds) in organic compounds. Alkenes and alkynes undergo electrophilic addition reactions with bromine water, leading to the decolourisation of the reddish-brown colour of bromine. Ethene, ethyne, and cyclohexene are unsaturated compounds and thus readily decolourise bromine water. Benzene is an aromatic compound and is highly stable due to resonance. It does not undergo addition reactions under normal conditions and therefore does not decolourise bromine water. Answer: Benzene