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Which of the following act as electrophile in halogenation?

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Which of the following act as electrophile in halogenation?

(a) Nitronium ion

(b) Sulphonium ion

(c) Halonium ion

(d) Acylium ion

The question was asked in an internship interview.

Question is from Electrophillic Substitution Reaction topic in portion Reactivity of Molecules Reaction Mechanism of Engineering Chemistry I

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The correct option is (c) Halonium ion

The explanation: Halonium ion act as electrophile in halogenation. Nitronium ion is used in nitration. Sulphonium ion is used in sulphonation. Acylium ion is used in acylation.

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