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Question

Which is the wrong IUPAC name of chlorocyclohexane-dione?

A
3-Chloro-1,4-cyclohexanedione
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B
2-Chloro-1, 3-cyclohexanedione
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C
4-Chloro-1,3-cyclohexanedione
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D
5-Chloro-1,3-cyclohexanedione
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Solution

The correct option is A 3-Chloro-1,4-cyclohexanedione
Position of chlorine is incorrectly mentioned. It is correctly written as:

Parent chain is cyclohexane ring.
-X (F, Cl, Br, I) do not have any priority order and considered as alkyl substituents while numbering

Ketones ( >C=O )
Suffix: one

The correct IUPAC name is 2-Chloro-1,4-cyclohexanedione

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