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In the common naming system, the prefix sym- is used for haloarenes with _____ halogen atoms.

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in Chemistry – Class 12 by (188k points)
In the common naming system, the prefix sym- is used for haloarenes with _____ halogen atoms.

(a) 1

(b) 2

(c) 3

(d) 4

I got this question in exam.

The doubt is from Haloalkanes Nomenclature in division Haloalkanes and Haloarenes of Chemistry – Class 12

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The correct choice is (c) 3

Explanation: The prefix sym- is used for trihaloarenes with same halogen atom at alternate positions in the benzene ring (1, 3, 5). The prefixes o-, m- and p- are used for dihaloarenes depending on the relative positions of the two identical halogen atoms on the aromatic ring.

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