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Benzene on treatment with excess of chlorine in the presence of anhydrous AlCl3 , under dark and cold condition yield ‘X’. Identify X.

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Benzene on treatment with excess of chlorine in the presence of anhydrous AlCl3 , under dark and cold condition yield ‘X’. Identify X.

(a) Chlorobenzene

(b) Hexachlorobenzene

(c) Benzene Hexachloride

(d) Acetophenone

I had been asked this question in final exam.

This interesting question is from Aromatic Hydrocarbon topic in division Hydrocarbons of Chemistry – Class 11

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Right choice is (b) Hexachlorobenzene

Easiest explanation: If excess of electrophilic reagent is used, substitution reaction may take place in which other hydrogen atoms of benzene ring may also be successively replaced by electrophile. Benzene on treatment with excess of chlorine in the presence of anhydrous AlCl3 can be chlorinated to hexachlorobenzene.

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