NEET Chemistry Question (2026) — Solution

Step-by-step solution

Reaction 1 is an electrophilic aromatic substitution. Benzene reacts with excess chlorine in the presence of anhydrous AlCl _3 (a Lewis acid) to form hexachlorobenzene ( C _6 Cl _6). C _6 H _6 + 6 Cl _2 [ dark, cold ] Anhydr. AlCl _3 C _6 Cl _6 + 6 HCl The organic product X is hexachlorobenzene, which contains 6 chlorine atoms. Reaction 2 is a free radical addition reaction. Benzene reacts with chlorine in the presence of UV light to form benzene hexachloride ( C _6 H _6 Cl _6), also known as gammaxene or lindane. C _6 H _6 + 3 Cl _2 [500\ K ] UV C _6 H _6 Cl _6 The organic product Y is benzene hexachloride, which contains 6 chlorine atoms. Therefore, the number of chlorine atoms in both X and Y is 6. Answer: 6 and 6