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Benzene undergoes free radical addition with ${Cl}_{2}$ in presence of sunlight

Benzene decolourises the purple colour of ${MnO}_{4}^{-} / {OH}^{-}$

Benzene undergoes electrophilic substitution most readily

Benzene cannot react with HBr

answer is B.

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Detailed Solution

When benzene reacts with chlorine in presence of catalyst ${AlCl}_{3}$ or in presence of ultraviolet light then it gives chlorobenzene.
Benzene undergoes electrophilic substitution easily because it has delocalised electron around the ring which increases electron density due to which more electrophile is attracted towards it.
Benzene does not decolourise the alkaline ${KMnO}_{4}$ . Benzene has most stable ring because of delocalised electron, electron density is high on it so it undergo substitution reaction but not addition reaction.

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