Iodoform can be prepared from all except:

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(D) The iodoform test is given by compounds containing the $CH_3CO-$ group or the $CH_3CH(OH)-$ group.$A$. Ethyl methyl ketone $(CH_3COCH_2CH_3)$ cont

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Isobutyl alcohol

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(D) The iodoform test is given by compounds containing the $CH_3CO-$ group or the $CH_3CH(OH)-$ group.$A$. Ethyl methyl ketone $(CH_3COCH_2CH_3)$ contains the $CH_3CO-$ group,so it gives a positive iodoform test.$B$. Isopropyl alcohol $(CH_3CH(OH)CH_3)$ contains the $CH_3CH(OH)-$ group,so it gives a positive iodoform test.$C$. $3-$Methyl$2-$butanone $(CH_3COCH(CH_3)_2)$ contains the $CH_3CO-$ group,so it gives a positive iodoform test.$D$. Isobutyl alcohol $(CH_3CH(CH_3)CH_2OH)$ does not contain either the $CH_3CO-$ or $CH_3CH(OH)-$ group. Therefore,it does not give a positive iodoform test.

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