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NEET 2026, Chemistry Q15: Aromatic Hydrocarbons: Benzene

NEET2026Chemistry
Q.

The number of chlorine atoms present in the organic products X and Y of the following reactions, respectively are :

  1. A

    3 and 3

  2. B

    6 and 6

  3. C

    6 and 3

  4. D

    3 and 6

Solution

With anhydrous AlCl in dark and cold conditions, benzene undergoes electrophilic substitution and all six ring hydrogens are replaced, giving hexachlorobenzene CCl (X) which contains 6 chlorine atoms.

Under UV light at 500 K, benzene undergoes free-radical addition to give 1,2,3,4,5,6-hexachlorocyclohexane CHCl (Y), which also contains 6 chlorine atoms.

So both X and Y contain 6 chlorine atoms each.

Concept behind this question

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