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(C) Compounds that give a positive iodoform test must contain either a methyl ketone group $(CH_3CO-)$ or a methyl carbinol group $(CH_3CH(OH)-)$.$(a)

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$4$

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(C) Compounds that give a positive iodoform test must contain either a methyl ketone group $(CH_3CO-)$ or a methyl carbinol group $(CH_3CH(OH)-)$.$(a)$ $1-$Phenylbutan$-2-$one: Structure is $Ph-CH_2-CO-CH_2-CH_3$. It does not contain a $CH_3CO-$ group. (Negative)$(b)$ $2-$Methylbutan$-2-$ol: Structure is $CH_3-C(OH)(CH_3)-CH_2-CH_3$. It does not contain a $CH_3CH(OH)-$ group. (Negative)$(c)$ $3-$Methylbutan$-2-$ol: Structure is $CH_3-CH(OH)-CH(CH_3)_2$. It contains a $CH_3CH(OH)-$ group. (Positive)$(d)$ $1-$Phenylethanol: Structure is $Ph-CH(OH)-CH_3$. It contains a $CH_3CH(OH)-$ group. (Positive)$(e)$ $3,3-$dimethylbutan$-2-$one: Structure is $CH_3-CO-C(CH_3)_3$. It contains a $CH_3CO-$ group. (Positive)$(f)$ $1-$Phenylpropan$-2-$ol: Structure is $Ph-CH_2-CH(OH)-CH_3$. It contains a $CH_3CH(OH)-$ group. (Positive)Thus,the compounds $(c)$,$(d)$,$(e)$,and $(f)$ give a positive iodoform reaction. The total number of such compounds is $4$.

Among the following,the number of compounds which will give positive iodoform reaction is:
$(a)$ $1-$Phenylbutan$-2-$one
$(b)$ $2-$Methylbutan$-2-$ol
$(c)$ $3-$Methylbutan$-2-$ol
$(d)$ $1-$Phenylethanol
$(e)$ $3,3-$dimethylbutan$-2-$one
$(f)$ $1-$Phenylpropan$-2-$ol

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Among the following,the number of compounds which will give positive iodoform reaction is:$(a)$ $1-$Phenylbutan$-2-$one$(b)$ $2-$Methylbutan$-2-$ol$(c)$ $3-$Methylbutan$-2-$ol$(d)$ $1-$Phenylethanol$(e)$ $3,3-$dimethylbutan$-2-$one$(f)$ $1-$Phenylpropan$-2-$ol